Welding of Fe-Al Intermetallic Compound and Steel by SPS Technology

2012 ◽  
Vol 581-582 ◽  
pp. 582-585
Author(s):  
Guo Dong Zhang ◽  
Ya Dong Xiao ◽  
Nian Liu ◽  
Min Hong
Keyword(s):  
Intermetallic Compound ◽  
Base Metal ◽  
Heat Affected Zone ◽  
High Strength Steel ◽  
Chemical Potential ◽  
High Strength ◽  
Micro Hardness ◽  
Axial Pressure ◽  
Welding Joint ◽  
Short Period

The welding between Fe-Al intermetallic compound and high-strength steel was done via SPS technology. Microstructure, elements concentration and micro-hardness of welding joint were examined. The results indicated that there was no obvious welding heat-affected zone in both Fe-Al intermetallic compound and high-strength steel. The HAZ microstructures of high-strength steel were mainly martensite. In Fe-Al intermetallic compound, the grain size of heat-affected zone was larger than that of base metal and the density of heat-affected zone was lower than that of base metal. Besides, the grains of base metal had deformation phenomena. The welding joint had steady performance and the connection was reliable. Under the influence of chemical potential differences, unidirectional impulses discharge current and axial pressure, elements diffused perfectly in a short period of time.

Experiment Research on Tensile-Shear Behavior of Spot-Welded Lap Joints of Ultra-High Strength Steel with Common Steel

2013 ◽  
Vol 716 ◽  
pp. 266-270
Author(s):  
Xiang Li ◽  
Xiao Yang Li ◽  
Hui Ping Yu ◽  
Ya Li
Keyword(s):  
Base Metal ◽  
Heat Affected Zone ◽  
High Strength Steel ◽  
Spot Welding ◽  
Tensile Strain ◽  
High Strength ◽  
Weld Nugget ◽  
Tensile Shear ◽  
Welding Joint ◽  
Ultra High Strength Steel

The welding spot of Ultra-high strength steel of 22MnB5 and common steel of St16 were the investigative objects, the intermediate frequency inverter & electric servo welding system was used to weld the sheets. Electrical measuring test method was used on spot-welded joint under tensile-shear load to determinate the strain of different positions, including the strain of weld nugget, the stain around the nugget and the base metals strain near the weld nugget. The deformation regularity of spot welding joints surrounding and base metal were analysed according to the data. The test provided a reference for the numerical simulation of spot welding model. Test results show that the strain distribution on spot welding joint is not uniform, the strain of the weld nugget center is relatively small, large deformation exists mainly in the heat affected zone. That is to say, the area near the spot-welding joint heat affected zone is prone to yield. The base metal area near the weld nugget is mainly affected by tensile strain, and the strain increases with the increasing of the load. The force condition of the specimen is complicated around the nugget, the relationship between the load and the strain is erratic. The strain of the weld nugget will gradually change from axial compressive strain to axial tensile strain. The strain of spot welding specimen made of dissimilar materials (22MnB5& ST16) is negative, and almost linearly.

scholarly journals Effect of Particle Size on Microstructure and Element Diffusion at the Interface of Tungsten Carbide/High Strength Steel Composites

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4164 ◽  
Author(s):  
Hongmei Zhang ◽  
Hongnan Li ◽  
Ling Yan ◽  
Chao Wang ◽  
Fangfang Ai ◽  
...  
Keyword(s):  
Particle Size ◽  
Tungsten Carbide ◽  
High Strength Steel ◽  
Average Particle Size ◽  
High Strength ◽  
Average Particle ◽  
Micro Hardness ◽  
Vacuum Sintering ◽  
Element Diffusion ◽  
Average Grain Size

The microstructure and micro-hardness of tungsten carbide/high strength steel (WC/HSS) composites with different particle sizes were analyzed by optical microscopy (OM), scanning electron microscopy (SEM), ultra-high temperature laser confocal microscopy (UTLCM) and micro-hardness testing. The composites were prepared by cold pressing and vacuum sintering. The results show that WC density tends to increase as the average grain size of WC decreases and the micro-hardness of WC increases with the decrease of WC particle size. The micro-hardness of WC near the bonding interface is higher than that in other regions. When the particle size of WC powder particles is 200 nm, a transition layer with a certain width is formed at the interface between WC and HSS, and the combination between the two materials is metallurgical. The iron element in the HSS matrix diffuses into the WC structure in contact with it, resulting in a fusion layer of a certain width, and the composite interface is relatively well bonded. When the average particle size of WC powder is 200 nm, W, Fe and Co elements significantly diffuse in the transition zone at the interface. With the increase of WC particle size, the trend of element diffusion decreases.

Analysis on Welding Performance of the WH80 Steel Used in the Hydraulic Support

2011 ◽  
Vol 225-226 ◽  
pp. 111-114
Author(s):  
Lian Min Cao ◽  
Guo Xiu Su ◽  
Qing Liang Zeng ◽  
Xing Yuan Xiao
Keyword(s):  
Heat Affected Zone ◽  
High Strength Steel ◽  
Arc Welding ◽  
High Strength ◽  
Hardness Test ◽  
Bend Test ◽  
Hydraulic Support ◽  
Good Material

This paper mainly has carried on the analysis to the welding performance of high strength steel WH80, through the stretch and the bend test of manual welding rod, arc welding, the slanting y bevel weld crack test and the highest hardness test in welding heat-affected zone. It indicates that the WH80 steel has the good welding performance and is good material for hydraulic support.

Hydrogen-induced cold cracking in heat-affected zone of low-carbon high-strength steel

2014 ◽  
Vol 94 (12) ◽  
pp. 764-771 ◽  
Author(s):  
Liangyun Lan ◽  
Xiangwei Kong ◽  
Zhiyong Hu ◽  
Chunlin Qiu
Keyword(s):  
Heat Affected Zone ◽  
High Strength Steel ◽  
High Strength ◽  
Cold Cracking ◽  
Low Carbon

Hot Stamping High Strength Steel Spot Welding Technology and Quality Evaluation of Welding Joint

2014 ◽  
Vol 1063 ◽  
pp. 181-185
Author(s):  
Su Feng Hao ◽  
Zhong De Shan ◽  
Shu Jun Chen ◽  
Chao Jiang
Keyword(s):  
High Strength Steel ◽  
Spot Welding ◽  
Quality Evaluation ◽  
Hot Stamping ◽  
High Strength ◽  
Interfacial Fracture ◽  
Welding Parameters ◽  
Local Cooling ◽  
Welding Joint ◽  
Pull Out

The heterogeneity of microstructure and mechanical performance of welding joints were affected by unique material properties such as high resistivity and low thermal conductivity, instantaneous high temperature of spot welding thermal cycle, and uneven local cooling rate. Because of ultra high strength of hot stamping parts, the welding joint is more inclined to fail as the failure mode of interfacial fracture, the traditional critical nugget formula fell down. Through designing orthogonal experiment, the effect of different welding parameters on joint performance was analyzed, the optimized welding process was obtained; on account of the quality evaluation of welding joint, nugget spherical mode was built to separately analyze the stress condition of welding joint in the failure modes of interfacial fracture and nugget pull-out, the new evaluation criterion aimed at high strength steel was established. Two kinds of 1.2 mm and 2.0 mm steels were used to validate the critical weld diameter. Results showed that the critical formula could accurately evaluate failure of the weld joints.

scholarly journals Application of hummer peening on base metal to high-strength steel

2018 ◽  
Vol 36 (3) ◽  
pp. 206-211
Author(s):  
Yoshihiro SAKINO ◽  
Yasuyuki KURIHARA ◽  
Seiichiro TSUTSUMI
Keyword(s):  
Base Metal ◽  
High Strength Steel ◽  
High Strength
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