Electron Backscattered Diffraction Characterization of S900 HSLA Steel Welded Joints and Evolution of Mechanical Properties

2022 ◽  
Author(s):  
M. Narimani ◽  
E. Hajjari ◽  
M. Eskandari ◽  
J. A. Szpunar
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Hsla Steel ◽  
Electron Backscattered Diffraction

scholarly journals Characterization of Mechanical Heterogeneity in Dissimilar Metal Welded Joints

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4145
Author(s):  
He Xue ◽  
Zheng Wang ◽  
Shuai Wang ◽  
Jinxuan He ◽  
Hongliang Yang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Welded Joints ◽  
Structural Integrity ◽  
Material Interfaces ◽  
Mechanical Heterogeneity ◽  
Finite Element Software ◽  
Dissimilar Metal ◽  
Stress Changes

Dissimilar metal welded joints (DMWJs) possess significant localized mechanical heterogeneity. Using finite element software ABAQUS with the User-defined Material (UMAT) subroutine, this study proposed a constitutive equation that may be used to express the heterogeneous mechanical properties of the heat-affected and fusion zones at the interfaces in DMWJs. By eliminating sudden stress changes at the material interfaces, the proposed approach provides a more realistic and accurate characterization of the mechanical heterogeneity in the local regions of DMWJs than existing methods. As such, the proposed approach enables the structural integrity of DMWJs to be analyzed in greater detail.

Effect of Microalloying Elements on Mechanical Properties in the High Strength Low Alloy Steel

2015 ◽  
Vol 830-831 ◽  
pp. 231-233 ◽  
Author(s):  
P.K. Mandal ◽  
Ravi Kant
Keyword(s):  
Mechanical Properties ◽  
Hsla Steel ◽  
High Strength ◽  
Microstructural Characterization ◽  
Strengthening Mechanism ◽  
Treatment Processes ◽  
Heating Treatment ◽  
Secondary Precipitates ◽  
Microalloying Elements

The effect of microalloying elements in Ti-Nb-V containing high strength low alloy (HSLA) steel has been investigated in the present study. The addition of low alloying elements (such as Ti, Nb and V) and distinct heating treatment processes has been used to improve the mechanical properties of HSLA steel. The effect on the microstructure and mechanical properties of normalizing treatment (at 950°C) of as forged steel has been investigated. The microstructural characterization of microalloyed HSLA steel is carried out by using different techniques such as optical microscopy, scanning electron microscopy (SEM) etc. The hardness, tensile testing and Charpy V notch impact tests are performed to study the mechanical behaviour of the alloy. It has been concluded that the precipitation strengthening mechanism for the improvement of impact toughness due to secondary precipitates such as TiN, Ti(C, N), VN etc.

Characterization of Mechanical Properties and Residual Stress in API 5L X80 Steel Welded Joints

2017 ◽  
Vol 27 (1) ◽  
pp. 124-137 ◽  
Author(s):  
Amilton de Sousa Lins ◽  
Luís Felipe Guimarães de Souza ◽  
Maria Cindra Fonseca
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Welded Joints ◽  
X80 Steel

Correlation between GMAW Parameters and Mechanical Properties of Hot-Rolled, High-Strength Low-Alloy (HSLA) Steel Butt Joints

2021 ◽  
Vol 890 ◽  
pp. 25-32
Author(s):  
Alin Constantin Murariu ◽  
Aurel Valentin Bîrdeanu
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Hsla Steel ◽  
Gas Metal Arc Welding ◽  
High Strength ◽  
Steel Plates ◽  
Experimental Program ◽  
Welding Parameters ◽  
Main Process ◽  
Hot Rolled

In all industrial fields, the product requirements are more and more demanding. HSLA steels are designed to provide higher atmospheric corrosion resistance and improved mechanical properties than structural steels. The paper presents the results of an experimental program based on factorial design, applied to predict the mechanical properties of butt-welded joints of S420MC and S460MC hot-rolled, high-strength low-alloy (HSLA) steel plates with 2mm, 4mm and 8mm thickness. Gas Metal Arc Welding (GMAW) was used and correlations between the main process parameters and the related mechanical properties of the welded joints were found. Obtained mathematical correlations can be exploited to provide optimal combination of welding parameters to fit the quality requirements of the end-users for envisaged welded product.

scholarly journals Microstructure Evolution and Mechanical Properties of Underwater Dry Welded Metal of High Strength Steel Q690E Under Different Water Depths

2020 ◽  
Vol 27 (4) ◽  
pp. 112-119
Author(s):  
Kun Sun ◽  
Yu Hu ◽  
Yonghua Shi ◽  
Baoyi Liao
Keyword(s):  
Mechanical Properties ◽  
Hsla Steel ◽  
High Strength ◽  
Fracture Morphology ◽  
Optical Microscope ◽  
Electron Backscattered Diffraction ◽  
Dislocation Movement ◽  
Ebsd Technique ◽  
Water Depths ◽  
Scanning Electron

AbstractQ690E high strength low alloy (HSLA) steel has been intensively applied in maritime engineering. Also, the underwater dry welding (UDW) technique has been widely used to repair important offshore facilities. In this paper, joints of Q690E steel were fabricated through single-pass underwater dry welding at three pressures (0, 0.2, and 0.4 MPa). To study the effect of the pressure on the microstructure and mechanical properties of the UDW joint, an optical microscope (OM) and scanning electron microscope (SEM) were used to observe the microstructure and fracture morphology of the welded joints. The electron backscattered diffraction (EBSD) technique was used to analyse the crystallographic features and the crystallographic grain size of the ferrites. The proportion of acicular ferrite (AF) in the UDW joints and the density of low-angle boundaries increase dramatically with the increasing depth of water. The weld metal of UDW-40 shows higher strength because more fine ferrites and low-angle boundaries within UDW-40 impede the dislocation movement.

Microstructural Characterization of Ultrasonically Welded Aluminum

2005 ◽  
Vol 127 (1) ◽  
pp. 65-74 ◽  
Author(s):  
S. M. Allameh ◽  
C. Mercer ◽  
D. Popoola ◽  
W. O. Soboyejo
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Weld Zone ◽  
Microstructural Characterization ◽  
Weld Interface ◽  
Fatigue Properties ◽  
Second Phase ◽  
Welding Time ◽  
Second Phase Particles

The microstructure and mechanical properties of ultrasonically welded AA6111-T4 specimens are discussed. The effects of welding time on the mechanical properties of welded joints are investigated. A longer welding time results in a more continuous welded interface and higher yield and fracture strengths. Accordingly, fatigue properties of the welded specimens with longer welding times are improved. The results of electron microscopy on the cross section of ultrasonically welded joints show three distinct zones: weld zone, weld affected zone and compression zone each with a distinct microstructure. TEM results show nanocrystalline grains along with second phase particles in the range of 15–25 nm in the weld zone. Flow patterns consistent with the geometry of weld–tip were observed at the weld interface.

scholarly journals Microstructure and mechanical properties of as-cast and annealed high strength low alloy steel

2019 ◽  
Vol 8 (4) ◽  
pp. 1
Author(s):  
Bárbara Ferreira de Oliveira ◽  
Michel Picanço Oliveira ◽  
Luis Augusto Hernandez Terrones ◽  
Márcia Giardinieri de Azevedo ◽  
Leonardo Barbosa Godefroid
Keyword(s):  
Mechanical Properties ◽  
Hsla Steel ◽  
Cast Steel ◽  
High Strength ◽  
Calcium Content ◽  
Casting Process ◽  
Mechanical Tests ◽  
Solidification Structure ◽  
Microstructure And Mechanical Properties

This paper presents a study on the microstructure and mechanical properties of a microalloyed HSLA steel solidified by continuous casting process and annealed at 1100 °C for 1 hour. The techniques of confocal microscopy, scanning electron microscopy and hardness, tensile and Charpy mechanical tests were used. The results of this research showed that the microstructure of the sample in the as-received condition was mainly composed of acicular ferrite and aggregates of ferrite and carbides. Non-metallic inclusion characterization of as-cast steel showed that calcium content was not enough to modify the morphology of some aluminates. After thermal treatment, the initial microstructure was transformed into polygonal ferrite and pearlite. In both conditions, different types of precipitates were found, which were classified according to their distribution in the microstructure. The steel with solidification structure showed a higher tensile strength, but its application would be unlikely in components that require good impact strength.

scholarly journals Synthesis and Characterization of Ni-P-Ti Nanocomposite Coatings on HSLA Steel

2020 ◽  
Author(s):  
Khuram Shahzad ◽  
Eman Mohamed Abdelkhalek Fayyad ◽  
Malik Adeel Umer ◽  
Osama Fayyaz ◽  
Tooba Qureshi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oil And Gas ◽  
Composite Coatings ◽  
Hsla Steel ◽  
High Strength ◽  
Nanocomposite Coatings ◽  
Superior Mechanical Properties ◽  
P Matrix

Nickel phosphorus (Ni-P) coatings possess tailored mechanical and anticorrosion properties and have found applications in industries like automotive, oil and gas, electronics, and aerospace. Their properties can further be enhanced by incorporating nanoparticles into their (Ni-P) matrix. In the present study, Ni-P-Ti nanocomposite coatings have been developed on high strength low alloy steel (HSLA) through electroless deposition technique. For this purpose, various concentrations of titanium (Ti) nanoparticles are used in the deposition bath containing 0.0g/L, 0.25g/L, 0.5g/L, 0.75g/L, and 1.0g/L nanoparticles. XDR, SEM, microhardness, and nanoindentation have been carried out to elucidate the role of Ti nanoparticle concertation on the microstructure and mechanical properties of the Ni-P-Ti composite coatings. XRD and EDX results confirm the incorporation of nanoparticles into the Ni-P matrix during deposition processing. SEM and AFM results exhibit the formation of a dense, uniform coating without any observable defects. An increase in the mechanical properties of the Ni-P matrix was observed by the addition of Ti nanoparticles. Superior mechanical properties were shown by the samples containing 0.5g/L Ti nanoparticle concentration. Improvement in the structural, as well as mechanical properties of Ni- P matrix by the addition of Ti, confirms the suitability of Ni-P-Ti composite coatings for various engineering applications.

scholarly journals EBSD Characterization of the Microstructure of 7A52 Aluminum Alloy Joints Welded by Friction Stir Welding

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6362
Author(s):  
Xu Liu ◽  
Ruiling Jia ◽  
Huixia Zhang ◽  
Wenhua Cheng ◽  
Xiwei Zhai
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Welded Joints ◽  
Fracture Behavior ◽  
Taylor Factor ◽  
Electron Backscattered Diffraction ◽  
Friction Stir ◽  
7A52 Aluminum Alloy ◽  
Significant Difference ◽  
Ebsd Technique

The microstructure and texture of materials significantly influence the mechanical properties and fracture behavior; the effect of microstructure in different zones of friction stir-welded joints of 7A52 aluminum alloy on fracture behavior was investigated in this paper. The microstructural characteristics of sections of the welded joints were tested using the electron backscattered diffraction (EBSD) technique. The results indicate that the fracture is located at the advancing side of the thermomechanically affected zone (AS-TMAZ) and the stir zone (SZ) interface. The AS-TMAZ microstructure is vastly different from the microstructure and texture of other areas. The grain orientation is disordered, and the grain shape is seriously deformed under the action of stirring force. The grain size grows unevenly under the input of friction heat, resulting in a large amount of recrystallization, and there is a significant difference in the Taylor factor between adjacent grains and the AS-TMAZ–SZ interface. On the contrary, there are fine and uniform equiaxed grains in the nugget zone, the microstructure is uniform, and the Taylor factor is small at adjacent grains. Therefore, the uneven transition of microstructure and texture in the AS-TMAZ and the SZ provide conditions for crack initiation, which become the weak point of mechanical properties.

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