马氏体含量对双相钢焊点拉拉疲劳性能的影响
Influence of martensite content on tension-compression fatigue life of spot-weld joints of dual-phase steels
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摘要: 焊点的疲劳性能是决定车身安全性和可靠性的重要因素. 对不同强度的DP780,DP980和DP1180双相钢焊点进行了检验，在疲劳试验机上进行了拉剪疲劳试验，获得了焊点的疲劳寿命曲线，分析了焊点显微组织、硬度与疲劳性能的关系. 并对焊点的疲劳失效进行了分析. 结果表明：母材性能对其焊点的疲劳性能有较大影响. 母材强度越高即马氏体含量越多，其疲劳性能越优异，三种材料的失效模式均是沿着焊点圆周断裂，裂纹在熔核与母材交界的热影响区萌生，且先贯穿板厚，贯穿板厚的裂纹作为二次裂纹源向板宽方向扩展直至断裂.Abstract: The fatigue performance of spot-weld joints is an important factor to determine the safety and reliability of the car body. The welded joints of DP780, DP980 and DP1180 were inspected. Load-life curves of the welded joints were obtained by the fatigue test on fatigue test machine. The relationship between microstructure, micro-hardness distribution of spot welds and fatigue properties of spot-weld joints was analyzed. And then, the fatigue failure of solder joint was analyzed. The results showed that spot-weld joints fatigue performance was affected by base material properties. The higher martensite content, the better fatigue property. All of the three fatigue failure modes were fracture along the circumference. It was found that the fatigue cracks mainly initiated at the heat affected zone between the fusion zone and the base material, and firstly penetrated through the sheets along thickness. Finally, the through-thickness cracks could be considered as the secondary fatigue crack source, which grew into the base material along the direction of width up to the fracture of weld joints.
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Keywords:
- DP steels /
- spot-weld /
- microstructure /
- hardness /
- fatigue strength
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[1] 康永林, 邝 霜, 刘仁东, 等. 汽车用冷轧双相钢的生产工艺及组织性能特征[J]. 鞍钢技术, 2008(4): 1-8Kang Yonglin, Kuang Shuang, Liu Rendong,et al. Production technology and structure property of cold rolled dual phase steel for automobiles[J]. Angang Technology, 2008(4): 1-8.[2] 杨 柳. 热成形钢板B1500HS电阻点焊性能研究及工艺优化[D]. 上海: 上海交通大学, 2012.[3] Rathbun R W, Matlock D K, Speer J G. Fatigue behavior of spot welded high-strength sheet steels[J]. Welding Journal, 2003, 82(8): 207-218.[4] Shariati M, Maghrebi M J. Experimental study of crack growth behavior and fatigue life of spot weld tensile-shear specimens[J]. Journal of Applied Science, 2009, 9(3): 438-448.[5] 许 君, 张延松, 朱 平, 等. 双相钢搭接点焊接头疲劳寿命分析[J]. 焊接学报, 2008, 29(5): 45-48.Xu Jun, Zhang Yansong, Zhu Ping,et al. Fatigue life analysis of lap-shear spot weld of dual phase steels[J]. Transctions of the China Welding Institution, 2008, 29(5): 45-48.[6] Saai A, Hopperatad O S, Granbom Y. Influence of volume fraction and distribution of matensite phase on the strain localization in dual phase steels[J]. Procedia Material Science, 2014(3): 900-905.[7] 孙晓屿, 黄 雷, 王武荣, 等. DP780双相钢电阻点焊的数值模拟及试验验证[J]. 焊接学报, 2016, 37(4): 85-88.Sun Xiaoyu, Huang Lei, Wang Wurong,et al. Numerical simulation and experimental verification of resistance spot welding with DP780 dual-phase steel[J]. Transctions of the China Welding Institution, 2016, 37(4): 85-88.[8] Pouranvari, Marashi. Critical review of automotive steels spot welding: process, structure and properties[J]. Science and Technology of Welding and Joining, 2013(18): 361-403.[9] 王晓光, 宇慧平, 李晓阳, 等. 超高强度钢点焊结构疲劳试验分析[J]. 焊接学报, 2016, 37(2): 99-102.Wang Xiaoguang, Yu Huiping, Li Xiaoyang,et al. Fatigue test analysis of ultra-high strength steel spot welded structure[J]. Transctions of the China Welding Institution, 2016, 37(2): 99-102.[10] Hassanifard S, Bonab M A M. Investigation of fatigue crack propagation in spot-welded joints based on fracture mechanics approach[J]. Journal of Materials Engineering and Performance, 2013, 22(1): 245-250. -
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