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硼钢镀层对热成形激光拼焊板组织及性能的影响

Effect of Boron Steel Coating on Microstructure and Property of Laser Tailor-Welded Blanks After Hot Stamping

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摘要

研究了不同Al-Si镀层去除状态下Usibor 1500钢激光拼焊后和热成形后焊接接头的组织特征, 并采用室温拉伸试验测试了热成形后焊接接头的力学性能。结果表明, 拼焊后的焊缝区显微组织为粗大板条马氏体和在光学显微镜下呈白色不均匀的第二相,白色相随着去除镀层部位的增多而减少。接头拉伸断裂模式与焊缝中白色相的分布情况相关。镀层去除状态对激光拼焊板性能有着显著影响, 上表面镀层的去除可显著提升接头性能; 随着下表面镀层去除部位的增多, 接头拉伸性能提升, 且在上下表面镀层全部去除的情况下, 接头的抗拉强度达到最大。

Abstract

The microstructure features of welded joints after laser tailor-welding and hot stamping of Usibor 1500 steels are investigated. The mechanical properties of welded joints after hot stamping are tested by the room temperature tensile test. The results show that the microstructure of the weld seam is composed of coarse lath martensite and the unevenly distributed second phase with white color under the optical microscope. The white phase number decreases with the increase of coating removal parts. The tensile fracture pattern of the welded joint is related to the distribution of white phase in the weld seam. The removal state of coating has a significant effect on the performance of laser tailor-welded blanks. The removal of upper coating can significantly improve the performance of welded joints. The tensile property of welded joints is significantly improved with the number of the lower coating removal parts increases. The tensile strength of welded joint reaches the maximum value when all of the coatings are removed.

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中图分类号:TG456.7

DOI:10.3788/cjl201744.0402011

所属栏目:激光制造

收稿日期:2016-11-30

修改稿日期:2016-12-20

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陈晓莞:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240高新船舶与深海开发装备协同创新中心, 上海 200240
李芳:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240高新船舶与深海开发装备协同创新中心, 上海 200240
林文虎:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240高新船舶与深海开发装备协同创新中心, 上海 200240
金鑫:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240高新船舶与深海开发装备协同创新中心, 上海 200240
华学明:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240高新船舶与深海开发装备协同创新中心, 上海 200240

联系人作者:陈晓莞(xiaoguanf@163.com)

备注:陈晓莞(1990-), 男, 硕士研究生, 主要从事汽车车身用钢激光焊接方面的研究。

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引用该论文

Chen Xiaoguan,Li Fang,Lin Wenhu,Jin Xin,Hua Xueming. Effect of Boron Steel Coating on Microstructure and Property of Laser Tailor-Welded Blanks After Hot Stamping[J]. Chinese Journal of Lasers, 2017, 44(4): 0402011

陈晓莞,李芳,林文虎,金鑫,华学明. 硼钢镀层对热成形激光拼焊板组织及性能的影响[J]. 中国激光, 2017, 44(4): 0402011

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