Effect of heat treatment on the microstructure and properties of 25Cr2MoVA petroleum casing steel

2021 ◽  
Vol 112 (1) ◽  
pp. 78-84
Author(s):  
Pengjun Cao ◽  
Yilong Zhang ◽  
Kejian Li ◽  
Jiling Dong ◽  
Wei Wu
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Impact Toughness ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Maximum Hardness ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
The Impact

Abstract The 25Cr2MoVA steel was subjected to various heat treatments. We found that the hardness increased when the quenching temperature was in the range of 870 – 910 °C, and then it decreased for the temperature of 910 – 990 °C. The maximum hardness was 553 HV after quenching from 910 °C. Following quenching from 910°C, the 25Cr2Mo-VA steel was tempered in the temperature range of 560 to 750 °C. With an increase in the tempering temperature, the hardness and tensile strength of the material decreased, while the impact toughness increased; the corrosion resistance increased initially and then decreased. The best heat treatment process for the 25Cr2MoVA steel involved quenching form 910 °C and tempering at 650°C for 1 h, the hardness was 362 HV, the tensile strength reached 1 310 MPa, the impact energy reached 149 J, and the material exhibited the best corrosion resistance.

Development of Wear Resistant Cast Steel and Its Study on Mechanical Properties

2013 ◽  
Vol 712-715 ◽  
pp. 98-101
Author(s):  
Hong Bo Li ◽  
Jing Wang ◽  
Han Chi Cheng ◽  
Chun Jie Li ◽  
Xing Jun Su
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Impact Toughness ◽  
Treatment Process ◽  
Cast Steel ◽  
Heat Treatment Process ◽  
Temperature Quenching ◽  
Quenching Temperature ◽  
High Toughness ◽  
The Impact

This paper mainly through the experimental study on the heat treatment process and mechanical properties of cast steel 35CrMnSiMo.According to the effect of alloy elements in design of a high-toughness abrasion-resistant cast steel, Cr, Mn, Si, as the main alloy elements, supplemented by a small amount of Mo, the casting molding, for hardness and impact toughness test of mechanical properties of experimental steel. The results show that, the as-cast 35CrMnSiMo by 880 °C, quenching for 20min then, the same quenching temperature, quenching hardness of materials is far greater than the oil quenching hardness. Water quenching hardness up to 25% higher than the oil quenching hardness, The impact toughness of specimen is inversely proportional to the contrast relationship Hardness.

Influence of Heat Treatment on the Microstructure and Properties of 7Cr17Mo Martensitic Stainless Steel

2013 ◽  
Vol 820 ◽  
pp. 15-19
Author(s):  
Xiao Dong Du ◽  
Zi Li Song ◽  
Yi Qing Chen ◽  
Jia Qing Wang ◽  
Guang Fu Liu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Retained Austenite ◽  
Treatment Process ◽  
Martensitic Stainless Steel ◽  
Optical Microscope ◽  
Heat Treatment Process ◽  
Quenching Temperature ◽  
Microstructure And Properties ◽  
The Impact

This paper describes the influence of heat treatment process on the microstructure and properties of a new martensitic stainless steel, which contains 0.7% carbon, 17% chromium and 1% molybdenum and can be used as kitchen knives and scissors. The microstructure and properties of the tested alloys after quenching at 980 - 1100 °C and low tempering were investigated by means of optical microscope (OM), scanning electron microscope (SEM), Rockwell hardness tester and impact tester. The results show that the microstructure consists of acicular martensite, carbides and a litter retained austenite after quenching and tempering. The carbides are mainly (Fe,Cr)23C6. The content of retained austenite increases with the increase of the quenching temperature. The solubility of carbon in martensite changes similarly. The martensite gets coarser as the quenching temperature increasing. The maximum value of hardness is 59 HRC, when the quenching temperature is 1060 °C. The impact toughness increases when the quenching temperature increases from 980 °C to 1080 °C and then decreases. The suitable heat treatment process for this alloy is quenching at 1060 °C~1080 °C for 30 min and then tempering at 200°C.

Effects of Heat Treatment Process on Microstructure and Mechanical Properties of 31Mn2SiREB Cast Steel

2013 ◽  
Vol 762 ◽  
pp. 418-423
Author(s):  
Feng Zhang Ren ◽  
Feng Jun Li ◽  
Ling Bai ◽  
Yun Fei Wang
Keyword(s):  
Heat Treatment ◽  
Impact Energy ◽  
Treatment Process ◽  
Cast Steel ◽  
Diffusion Annealing ◽  
Heat Treatment Process ◽  
Micro Hardness ◽  
Quenching Temperature ◽  
Pre Treatment ◽  
The Impact

The heat treatment process of 31Mn2SiREB cast steel used in crawler shoes is directly lifted from the heat treatment process of Mn13 high-manganese cast steel, i. e., quenching at 1050 oC after casting. The reasonableness of the process needs to be surveyed. In this paper, the effects of quenching temperature and diffusion annealing pre-treatment on mechanical properties, micro-area composition uniformity and micro-hardness uniformity were investigated. For quenching after casting, the tensile strength and impact energy increase observably with the elevation of quenching temperature, but the impact energy at higher quenching temperature is still very small. The fluctuation of micro-hardness and chemical composition at different micro-areas becomes obviously small with the increase of quenching temperature. For quenching after a diffusion annealing pre-treatment, the impact energy is very high and up to 36.3 J.

Influence of Heat Treatment Process on the Structures and Properties of Grate Bars Used in Sintering Trolley

2014 ◽  
Vol 697 ◽  
pp. 95-101
Author(s):  
An Min Li ◽  
Ding Ma ◽  
Qi Feng Zheng ◽  
Ruo Huai Chen ◽  
Zu Jiang Huang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Treatment Process ◽  
The Other ◽  
Air Cooling ◽  
Heat Treatment Process ◽  
Eutectic Carbide ◽  
Maximum Hardness ◽  
Quenching Temperature ◽  
Structures And Properties

The as-cast structure of grate bar used in sintering trolley is primarily comprised of austenite and eutectic (eutectic austenite and eutectic carbide). The austenite is dendrite, while the carbide is reticular and chrysanthemum-like. The grate bars were quenched and tempered under various temperature (one set of samples: quenching (975~1050°C); the other: quenching (1000°C) + tempering (240~600°C)). With rise in quenching temperature, the content of martensite increases and gradually stabilizes, and the hardness increases and then decreases (the maximum is 61.5HRC). For the tempered simple, the strip-like carbides gradually become smaller, shorter and homogenized; the resistance to temper softening is high and the maximum hardness is 58HRC; the wear resistance gradually decreases and is lower than that of as-cast one when the temperature is higher than 480°C. The heat treatment process to improve the service properties of grate bars is: quenching (1000°C, 2.5h, and air-cooling) + tempering (300~420°C, 2.5h, and air-cooling).

Effect of Heat Treatment Processing Parameters on the Microstructure and Properties of Low-Carbon Cr-Ni-Mo Carburizing Bearing Steels

2015 ◽  
Vol 817 ◽  
pp. 231-237 ◽  
Author(s):  
Nan Zhang ◽  
Mao Sheng Yang ◽  
Shi Qing Sun
Keyword(s):  
Heat Treatment ◽  
Impact Toughness ◽  
Retained Austenite ◽  
Cryogenic Treatment ◽  
Processing Parameters ◽  
Bearing Steel ◽  
Low Carbon ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
The Impact

The low-carbon Cr-Ni-Mo carburizing bearing steel was tested with different heat treatment processes. Quenching-tempering temperature and cryogenic treatment (-73°C) wasstudied respectively onthe mechanical properties and microstructure.Results show thatthe increase of quenching temperature causes the micron-sized Cr-rich carbide re-dissolution and smaller quantity of retained austenite, makingthe strength and hardness of the tested steel increase and the impact toughness decrease. The tempering temperaturerising causesthe reduction of micro-residual stresses and smallerdegree of lattice distortion andlower dislocation density, resulting in the decrease of strength and the increase of impact toughness. Cryogenic treatment contributes to the refinement of martensite lath and precipitation of nanosized carbide and lowest quantity of retained austenite, improving the strength and impact toughness of the steel.The good comprehensive mechanical propertieswith the hardness of HRC41.3, tensile strength of 1413MPa,yield strength of 1168MPa, and impact toughness of 162J/cm2 can be obtainedby optimizing the heat treatment process parameters.

Heat Treatment of 10Cr12Ni3Mo2VN Blade Steel for Ultra Supercritical Unit

2015 ◽  
Vol 817 ◽  
pp. 472-478
Author(s):  
Jun Ru Li ◽  
Chen Gong ◽  
Le Yu Zhou ◽  
Lie Chen ◽  
Hui Zuo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Impact Toughness ◽  
Strength Properties ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
The Impact ◽  
Quenching And Tempering ◽  
Blade Steel ◽  
Tempering Process

In this work, the effects of final heat treatment including quenching and tempering process on mechanical properties of 10Cr12Ni3Mo2VN steel were investigated by orthogonal experimental. It is shown that, the quenching process had a small effect on the strength properties. But the impact property obviously decreased with the increase of quenching temperature, that is due to the grain coarsening. It can be found that tempering temperature is the major factor which affects the mechanical properties. Tempering process had a large effect on the precipitation of carbides and that affected the strength, toughness and plastic greatly. The impact toughness had a minimum after tempered at 650°C between 600°C~700°C. The experimental results show that the M23C6 type carbides precipitated at the grain and martensite lath boundary were the main reason which decreased the impact toughness when tempering temperature increased from 600°C to 650°C.

THE NEW HEAT TREATMENT TECHNOLOGY OF A356 ALUMINIUM ALLOY PREPARED BY PTC

2009 ◽  
Vol 23 (06n07) ◽  
pp. 906-913 ◽  
Author(s):  
LIANYONG ZHANG ◽  
YANHUA JIANG ◽  
ZHUANG MA ◽  
WENKUI WANG
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Treatment Process ◽  
A356 Alloy ◽  
Heat Treatment Process ◽  
X Rays ◽  
Treatment Technology ◽  
Conventional Heat Treatment

Phase Transition Cooling (PTC), using the absorbed latent heat during the melting of phase transition cooling medium to cool and solidify alloys in the process of casting, is a new casting technology. Specimens of A356 casting aluminum alloy were prepared by this method in the paper. The new heat treatment process (cast and then aging directly without solid solution) of A356 alloy was performed. For comparison, the conventional T6 heat treatment (solution and then aging treatment) was performed too. The mechanical properties of A356 alloy with different heat treatments were measured by tensile strength testing methods and microstructures of the alloy with different heat treatment process were investigated by optical microscopy (OM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-rays diffraction (XRD) and transmission electron microscopy (TEM) too. The results show that ultimate tensile strength (UTS) of A356 alloy with the new heat treatment process is much higher than that with conventional heat treatment while the elongations with the two heat treatment processes are very close. This is due to the grain refinement obtained after PTC processing.

scholarly journals The Effect of Tempering on the Microstructure and Mechanical Properties of a Novel 0.4C Press-Hardening Steel

2019 ◽  
Vol 9 (20) ◽  
pp. 4231
Author(s):  
Oskari Haiko ◽  
Antti Kaijalainen ◽  
Sakari Pallaspuro ◽  
Jaakko Hannula ◽  
David Porter ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Low Temperature ◽  
Impact Toughness ◽  
Retained Austenite ◽  
Hot Strip Mill ◽  
Tempering Temperature ◽  
Press Hardening ◽  
Dislocation Densities ◽  
The Impact

In this paper, the effects of different tempering temperatures on a recently developed ultrahigh-strength steel with 0.4 wt.% carbon content were studied. The steel is designed to be used in press-hardening for different wear applications, which require high surface hardness (650 HV/58 HRC). Hot-rolled steel sheet from a hot strip mill was austenitized, water quenched and subjected to 2-h tempering at different temperatures ranging from 150 °C to 400 °C. Mechanical properties, microstructure, dislocation densities, and fracture surfaces of the steels were characterized. Tensile strength greater than 2200 MPa and hardness above 650 HV/58 HRC were measured for the as-quenched variant. Tempering decreased the tensile strength and hardness, but yield strength increased with low-temperature tempering (150 °C and 200 °C). Charpy-V impact toughness improved with low-temperature tempering, but tempered martensite embrittlement at 300 °C and 400 °C decreased the impact toughness at −40 °C. Dislocation densities as estimated using X-ray diffraction showed a linear decrease with increasing tempering temperature. Retained austenite was present in the water quenched and low-temperature tempered samples, but no retained austenite was found in samples subjected to tempering at 300 °C or higher. The substantial changes in the microstructure of the steels caused by the tempering are discussed.

Study on the Corrosion Resistance of Magnesium Alloy AZ81 with Rare Earth

2011 ◽  
Vol 686 ◽  
pp. 332-336 ◽  
Author(s):  
Yu Cai Wu ◽  
Rui He ◽  
Lei Li
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
T6 Heat Treatment ◽  
Treatment Procedures ◽  
Different Content ◽  
Human Fluid ◽  
Rare Earth La

The influences of the different content of Rare earth La on the corrosion resistance of AZ81 in the simulated human fluid were studied. In order to further improve the corrosion resistance, different heat treatment procedures were studied. Results showed that with the increase of content of rare earth La, the grain size was refined and the corrosion resistance increased. The corrosion resistance was improved after T6 heat treatment (solid solution+ aging). Microstructure analysis showed that β-phases were precipitated in the T6 heat treatment process. Those fine β phases acted as corrosion barrier and impeded the corrosion extending.

Effects of Heat Treatment on the Mechanical and Tribological Properties of Aluminium (LM6) Reinforced with Iron Oxide (Fe2O3)

2020 ◽  
Vol 12 (3) ◽  
Author(s):  
J. Arun Prakash ◽  
P. Shanmughasundaram ◽  
M. Vemburaj ◽  
P. Gowtham
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Iron Oxide ◽  
Treatment Process ◽  
Casting Process ◽  
Stir Casting ◽  
Heat Treatment Process ◽  
Treatment Results ◽  
Mechanical And Tribological Properties

This work deals with the examination of the mechanical properties of Aluminium (LM6) reinforced with iron oxide (Fe2O3). Stir casting process is used to formulate the composite sampling by varying iron oxide in 5% and 10% by weight. Three different heat treatment process of hardening, annealing and normalizing is carried out on samples of aluminium (LM6), aluminium (LM6) + 5% Fe2O3 and aluminium (LM6) + 10% Fe2O3. Composite specimens are tested to analyze the mechanical properties such as hardness, yield stress, tensile strength and elongation. Present reinforcement specks enabled the alloy to preserve higher hardness during the heat treatment. Results have shown substantial improvements in properties of the specimens with various compositions of reinforcement.

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