scholarly journals Research on Carbide Characteristics and Their Influence on the Properties of Welding Joints for 2.25Cr1Mo0.25V Steel

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 891 ◽  
Author(s):  
Qing Li ◽  
Guangxu Cheng ◽  
Mu Qin ◽  
Yafei Wang ◽  
Zaoxiao Zhang
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Base Metal ◽  
Hydrogen Diffusion ◽  
Reference Value ◽  
Charpy Impact ◽  
Hydrogen Brittleness ◽  
Carbide Morphology ◽  
Welding Joints ◽  
Welding Metal

The carbide characteristics of 2.25Cr1Mo0.25V steel have an extremely important influence on the mechanical properties of welding joints. In addition, hydrogen resistance behavior is crucial for steel applied in hydrogenation reactors. The carbide morphology was observed by scanning electron microscopy (SEM) and the carbide microstructure was characterized by transmission electron microscopy (TEM). Tensile and impact tests were carried out and the influence of carbides on properties was studied. A hydrogen diffusion test was carried out, and the hydrogen brittleness resistance of welding metal and base metal was studied by tensile testing of hydrogenated samples to evaluate the influence of hydrogen on the mechanical properties. The research results show that the strength of the welding metal was slightly higher and the Charpy impact value was significantly lower compared to the base metal. The hydrogen embrittlement resistance of the welding metal was stronger than that of the base metal. The presence of more carbides and inclusions was the main cause of the decreased impact property and hydrogen brittleness resistance of the welding metal. These conclusions have certain reference value for designing and manufacturing hydrogenation reactors.

Gas metal arc welding of XPF800 steel for automotive industry: Microstructural evaluation and mechanical properties investigation

2021 ◽  
pp. 146442072110567
Author(s):  
Emre Korkmaz ◽  
Cemal Meran
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Automotive Industry ◽  
Heat Affected Zone ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Charpy Impact ◽  
Optical Microscope ◽  
Metal Arc Welding ◽  
Heat Affected Zone Softening

In this study, the effect of gas metal arc welding on the mechanical and microstructure properties of hot-rolled XPF800 steel newly produced by TATA Steel has been investigated. This steel finds its role in the automotive industry as chassis and seating applications. The microstructure transformation during gas metal arc welding has been analyzed using scanning electron microscope, optical microscope, and energy dispersive X-ray spectrometry. Tensile, Charpy impact, and microhardness tests have been implemented to determine the mechanical properties of welded samples. Acceptable welded joints have been obtained using heat input in the range of 0.28–0.46 kJ/mm. It has been found that the base metal hardness of the welded sample is 320 HV0.1. On account of the heat-affected zone softening, the intercritical heat-affected zone hardness values have diminished ∼20% compared to base metal.

scholarly journals Effects of Silicon Content and Tempering Temperature on the Microstructural Evolution and Mechanical Properties of HT-9 Steels

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 972 ◽  
Author(s):  
Junkai Liu ◽  
Wenbo Liu ◽  
Zhe Hao ◽  
Tiantian Shi ◽  
Long Kang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Microstructural Evolution ◽  
Charpy Impact ◽  
Hardness Test ◽  
Mechanical Tests ◽  
Fourth Generation ◽  
Martensitic Steels ◽  
Microscopic Mechanism ◽  
Tempering Temperature

Two kinds of experimental ferritic/martensitic steels (HT-9) with different Si contents were designed for the fourth-generation advanced nuclear reactor cladding material. The effects of Si content and tempering temperature on microstructural evolution and mechanical properties of these HT-9 steel were studied. The microstructure of experimental steels after quenching and tempering were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM); the mechanical properties were investigated by means of tensile test, Charpy impact test, and hardness test. The microscopic mechanism of how the microstructural evolution influences mechanical properties was also discussed. Both XRD and TEM results showed that no residual austenite was detected after heat treatment. The results of mechanical tests showed that the yield strength, tensile strength, and plasticity of the experimental steels with 0.42% (% in mass) Si are higher than that with 0.19% Si, whereas hardness and toughness did not change much; when tempered at 760 °C, the strength and hardness of the experimental steels decreased slightly compared with those tempered at 710 °C, whereas plasticity and toughness increased. Further analysis showed that after quenching at 1050 °C for 1 h and tempering at 760 °C for 1.5 h, the comprehensive mechanical properties of the 0.42% Si experimental steel are the best compared with other experimental steels.

Experimental Study on Mechanical Properties and Microstructure of 2.25Cr1Mo0.25V Steel by the Influence of Heat Treatment and Welding

2018 ◽  
Author(s):  
Qing Li ◽  
Guangxu Cheng ◽  
Mu Qin ◽  
Zaoxiao Zhang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Base Metal ◽  
Arc Welding ◽  
Treatment Time ◽  
Welding Process ◽  
Heat Treatment Time ◽  
Evolution Of Microstructure ◽  
Welding Metal ◽  
Submerged Arc

In this paper, the mechanical properties and microstructural changes of 2.25Cr1Mo0.25V steel under different heat treatment and welding process were investigated. The heat treatment of steel during practical processing is taken as a reference. Different heat treatment time are used to obtain samples with different condition. Automatic submerged arc welding was used to obtain welding sample. The mechanical properties of different samples are obtained by tensile test; the evolution of microstructure and precipitates of different sample with heat treatment and welding was studied on scanning electron microscopy. The experimental results show that with the increase of heat treatment time, the strength of the samples decreases and the plasticity remains nearly constant. Heat treatment also affects the precipitation of carbides; the longer the heat treatment time is, the more precipitates are. Compared with the base metal, the welding metal sample has higher strength. The amount of precipitates in welding metal is much larger than it in base metal. The research on precipitation shows that there are different kinds of precipitates which have different morphologies in welding metal.

Phase Stability and Mechanical Properties of C-22 Alloy Aged in the Temperature Range 590 to 760°C for 16,000 Hours

1999 ◽  
Vol 556 ◽  
Author(s):  
Tammy S. Edgecumbe Summers ◽  
Mark A. Wall ◽  
Mukul Kumar ◽  
Steven J. Matthews ◽  
Raú B. Rebak
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Grain Boundaries ◽  
Phase Stability ◽  
Charpy Impact ◽  
Uniform Thickness ◽  
Annealed Condition ◽  
Charpy Impact Toughness ◽  
Transmission Electron ◽  
Carbide Particles

AbstractThe phase stability of C-22 alloy (UNS #N06022) was studied by aging samples at 593, 649, 704 and 760°C for 2000 h (2.7 mo) and 16,000 h (1.8 yr). The tensile properties and the Charpy impact toughness of these samples were measured in the mill annealed condition as well as after aging. The microstructures of samples aged 16,000 hours were examined using scanning and transmission electron microscopy (SEM and TEM). Preliminary TEM results suggest that μse forms at all temperatures investigated. Discrete carbide particles in addition to a film with very uniform thickness which appears to be μ phase formed on grain boundaries in the sample aged at 593°C. The ordered Ni2(Cr, Mo) phase was also seen in this sample. At the higher aging temperatures, mainly μ phase forms covering all the grain boundaries and also distributed throughout the bulk. Although strength increased somewhat with aging. the ductility decreased due to the formation of these grain boundary precipitates and brittle intermetallics.

Study of Mechanical Properties and Fracture Mechanism of a New High-Temperature Alloys

2012 ◽  
Vol 271-272 ◽  
pp. 64-68
Author(s):  
Dong Xu Zhang ◽  
Da Shun Liu ◽  
Xi Ping Zhu
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Base Metal ◽  
Creep Test ◽  
Arc Welding ◽  
Tensile Fracture ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Welding Joints ◽  
High Temperature Tensile

GH3230 is a new type of superalloy,it is the first study about it. This paper studied the high temperature mechanical properties of the GH3230 base metal and argon-arc welding joints by high temperature tensile test,high temperature creep test and SEM analyses. The results showed thatthe ultimate tensile strength of GH3230 argon-arc welding joints is about 85.6% of that of base metal under the same conditions. In the high temperature creep test, GH3230 argon-arc welding joints had a longer creep life than that of base metal. Both GH3230 base metal and argon-arc welding joints showed a ductile fracture. High temperature tensile fracture is cavities fracture and high temperature creep fracture is intergranular fracture. The deformation of GH3230 argon-arc welding joints is much more uniformited and smaller than that of base material, and GH3230 argon-arc welding joints has less cracks.

The Examination of Weld Line Properties in Injection Molded PP Composites

2008 ◽  
Vol 589 ◽  
pp. 263-267 ◽  
Author(s):  
Balázs Solymossy ◽  
József Gábor Kovács
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Weld Line ◽  
Charpy Impact ◽  
Fiber Content ◽  
Impact Properties ◽  
Injection Molded ◽  
Scanning Electron

This paper focuses on the effect of different fiber content on the mechanical properties of specimens with and without weld lines. The effect of three different melt temperatures and holding pressures were also investigated. For the experiments dumbbell shaped standard tensile specimens with and without weld lines were injection molded from PP (TVK’s H116F homopolymer) and short glass fiber (0, 10, 20, 30, 40 wt%). The mechanical properties of these composites were determined by quasi-static (standard tensile testing) and dynamic (Charpy impact test) testing methods and the corresponding weld line factors were calculated. The fracture surfaces were analyzed with the help of scanning electron microscopy (SEM). From the results of the tensile and Charpy-impact tests, it was ascertained that the temperatures and the holding pressures during injection molding did not affect the tensile and impact properties, but fiber length had a major impact on the mechanical properties of this specific composite. By increasing the fiber content, the tensile strength increased until a peak and declined after. Whereas the impact resistance decreased by the increasing fiber content in the whole examination window. Comparing the weld lined and weld line free specimens, it was concluded that weld lines did significantly decrease the tensile strength and impact properties due to the unfavorable fiber orientation beside the weld line which was visualized by scanning electron microscopy.

Research on Microstructures and Mechanical Properties of Fiber Laser Welding of A7N01 Al-Alloy

2017 ◽  
Vol 734 ◽  
pp. 310-318 ◽  
Author(s):  
Yi Shuai Jiang ◽  
Shang Lei Yang ◽  
Yan Wang ◽  
Zhi Hua Yang
Keyword(s):  
Mechanical Properties ◽  
Fiber Laser ◽  
Base Metal ◽  
Welded Joint ◽  
Weld Interface ◽  
Al Alloy ◽  
Fiber Laser Welding ◽  
Welding Joint ◽  
Microstructures And Mechanical Properties ◽  
Welding Metal

A7N01 aluminum alloy with the thickness of 10mm is welded using fiber laser with filler wire, the microstructures and mechanical properties of the welding joints are observed and analyzed by microhardness and tensile testers, SEM. The results show that the crystalline morphology of the welding metal is equiaxial as-cast. the columnar crystals exist in the fusion zone next to the weld interface. A softening zone with the width of 1.6 mm is formed in the heat affected zone. Micro-hardness of the welding joint distributes uniformly, the highest is in base metal which is 110 HV and the lowest is in the welding joint which is 73 HV. The tensile strength of the welded joint is 281 MPa, the strength coefficient reached 70.6%. the fatigue strengths of the laser welded joint and the base metal are investigated. The results show that the conditional fatigue strength (107) of the laser welded joint can reach up to 63.6% of that of the base metal. there are fatigue striations generated during the steady-state region.

Microstructures and Properties of the Al-4.5Zn-1.5Mg-0.5Mn Aluminum Alloy Welding Joints

2010 ◽  
Vol 148-149 ◽  
pp. 640-643 ◽  
Author(s):  
Shang Lei Yang ◽  
Qing Lin Lin
Keyword(s):  
Aluminum Alloy ◽  
Base Metal ◽  
Heat Affected Zone ◽  
Percentage Elongation ◽  
Large Size ◽  
Columnar Grains ◽  
Welding Joints ◽  
Welding Metal ◽  
Microstructure And Mechanical Property ◽  
Precipitation Phase

The Al-4.5Zn-1.5Mg-0.5Mn aluminum alloy was welded by MIG welding in test, and the microstructure and mechanical property of joint were investigated. The results of experimentation show that the microstructure of welding metal is as-cast microstructure, and the microstructure of base metal is isometric crystal. There is a narrow fusion zone near the edge of weld seam, which consists of fine columnar grains. In the base metal and heat affected zone, the precipitation was diffuse in the intragranular, while strengthening phase η mainly focused on grain boundaries. The precipitation phases in the heat-affected zone distributed unevenly with large size, intermittent and segregation. In the welding metal, there is no precipitation phase. The microhardness on center of welding metal is lowest in joint. The tensile strength of welding joint is 272MPa, and the percentage elongation after fracture is 6.6%. The zone of fracture is located in the welding metal.

scholarly journals Investigation into the microstructure and properties of wire arc additive manufactured 09MnNiDR steel

2020 ◽  
Vol 29 ◽  
pp. 2633366X2094571
Author(s):  
Qin Xu ◽  
Guangdong Wang ◽  
Haitao Zhang
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Mechanical Properties ◽  
Charpy Impact ◽  
Crystal Defects ◽  
Impact Testing ◽  
Granular Bainite ◽  
Incomplete Fusion ◽  
Microhardness Distribution ◽  
High Resolution Tem

Cryogenic 09MnNiDR steel was prepared using arc additive manufacturing technology. Following manufacture, its phase composition, microstructure, and crystal structure were analyzed by spectrometer, X-ray diffraction, optical microscopy, scanning electron microscopy, and transmission electron microscopy (TEM). In addition, the mechanical properties of arc additive manufactured 09MnNiDR were determined by microhardness measurements, tensile testing, and Charpy impact testing. Results showed that the material displayed good quality form without defects, such as holes, cracks, solid inclusions, incomplete fusion and penetration, or unfavorable shape and size. Furthermore, it displayed good internal metallurgical bonding and has a metallographic structure composed mainly of ferrite and granular bainite. High-resolution TEM suggested sharp grain edges, as well as a large number of crystal defects, such as dislocations and martensite–austenite islands in the 09MnNiDR crystal structure. The material showed relatively uniform microhardness distribution on the longitudinal and transverse sections with average values of 188.2 and 167.5 HV0.2, respectively. Also, the material exhibited superior mechanical properties. Prior to heat treatment, the material presented a yield strength of 436 MPa, a tensile strength of 552 MPa, an elongation of 30%, and a Charpy impact value of 96 J at −70°C.

Effects of Root Opening on Physical and Mechanical Properties of the Double Side Welded of Ship Materials

2016 ◽  
Vol 835 ◽  
pp. 167-172
Author(s):  
Yustiasih Purwaningrum ◽  
Triyono ◽  
Tegar Rileh Argihono ◽  
Ryan Sutrisno
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Gas Metal Arc Welding ◽  
Weld Zone ◽  
Physical And Mechanical Properties ◽  
Charpy Impact ◽  
Hardness Test ◽  
Charpy Impact Test ◽  
Optical Microscope ◽  
Weld Metals

The effects of root opening process parameters on the phisical and mechanical properties of mild steel specimens of grade LR Gr A having dimensions 200 mm× 100 mm× 12 mm, welded by gas metal arc welding were investigated. The variation of root opening that used were 3 mm, 5 mm and 7 mm. The physical properties examined with regard with microstructure, macrosructure, and corrosion using optical microscope and stereozoom. The measured of mechanical properties with regard to strength, hardness and toughness using, tensile test, Vickers hardness Test, and Charpy impact test. The test results show the base metal had a hardness of approximately 110 VHN and a maximum hardness of approximately 190 VHN that corellates with microstructure of weld metals. Microstructure of base metal and HAZ are ferite and perlite, while microstructure of weld zone are acicular ferrite and grain boundary ferrite. The corrosion rate of weld metals with various root opening categorized as materials having excellent corrosion resistance value. Welding joints with opening roots 3 mm and 5 mm can be used for construction. All welded specimens exhibited fracture at base metals

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