摘要

采用光纤激光器对2.8 mm厚800 MPa级热轧高强钢板进行了激光焊接, 通过调整激光功率获得了全熔透焊接接头, 观察了不同热输入下焊接接头的显微组织, 并测试了焊接接头的显微硬度、拉伸性能和冲击韧性, 研究了焊接接头显微组织与力学性能之间的关系。结果表明：焊接接头内不存在软化区, 焊接接头的抗拉强度可达到母材水平, 冲击功可达到母材的85.6%。

Abstract

The 2.8 mm thick 800 MPa grade hot-rolled high strength steel plates are welded with fiber laser. The fully-penetration laser welded joints are obtained by adjusting the laser power. The microstructures of laser weld joints are observed, and the microhardness, tensile properties and impact toughness of the laser welded joints are tested. The relationship between microstructure and mechanical properties of laser welded joints is studied. The results show that there was no softening zone in the welded joint, the tensile strength of the welded joint can reach that of the base metal, and the impact energy of the welded joint can reach 85.6% of the base metal.

补充资料

中图分类号：TG113

DOI：10.3788/cjl201946.0102002

所属栏目：激光制造

基金项目：国家自然科学基金(51775102)、中国博士后基金特别资助项目(2018T110542)、东北大学轧制技术及连轧自动化国家重点实验室开放基金(2016005)

收稿日期：2018-08-06

修改稿日期：2018-08-24

网络出版日期：2018-09-05

作者单位    点击查看

联系人作者：王晓南(wxn@suda.edu.cn)

【1】Zhang F, Ruimi A, Wo P C, et al. Morphology and distribution of martensite in dual phase (DP980) steel and its relation to the multiscale mechanical behavior［J］. Materials Science and Engineering A, 2016, 659: 93-103.

【2】Xie C J, Yang S L, Liu H B, et al. Microstructures and mechanical properties of 7050 ultrahigh-strength aluminum alloy joints by laser welding［J］. Laser & Optoelectronics Progress, 2018, 55(3): 031403.
谢超杰, 杨尚磊, 刘浩博, 等. 7050高强铝合金激光焊接接头的组织性能［J］. 激光与光电子学进展, 2018, 55(3): 031403.

【3】Xu W, Westerbaan D, Nayak S S, et al. Microstructure and fatigue performance of single and multiple linear fiber laser welded DP980 dual-phase steel［J］. Materials Science and Engineering A, 2012, 553: 51-58.

【4】Ashrafi H, Shamanian M, Emadi R, et al. Correlation of tensile properties and strain hardening behavior with martensite volume fraction in dual-phase steels［J］. Transactions of the Indian Institute of Metals, 2017, 70(6): 1575-1584.

【5】Sun Z, Ion J C. Laser welding of dissimilar metal combinations［J］. Journal of Materials Science, 1995, 30(17): 4205-4214.

【6】Xia M S, Biro E, Tian Z L, et al. Effects of heat input and martensite on HAZ softening in laser welding of dual phase steels［J］. ISIJ International, 2008, 48(6): 809-814.

【7】Wang X N, Sun Q, Zheng Z, et al. Microstructure and fracture behavior of laser welded joints of DP steels with different heat inputs［J］. Materials Science and Engineering A, 2017, 699: 18-25.

【8】Wang T, Zhang M, Xiong W, et al. Microstructure and tensile properties of the laser welded TWIP steel and the deformation behavior of the fusion zone［J］. Materials & Design, 2015, 83: 103-111.

【9】Wang T, Zhang M, Liu R D, et al. Effect of heat input per unit length on microstructure and mechanical properties of laser welded joints of TRIP steel［J］. Shanghai Metals, 2017, 39(5): 51-56.
王涛, 张梅, 刘仁东, 等. 线能量对TRIP钢激光焊接接头显微组织及力学性能的影响［J］. 上海金属, 2017, 39(5): 51-56.

【10】Wang X N, Zheng Z, Zeng P L, et al. Effect of microstructure on hardness and fatigue properties of 800 MPa high strength steel fiber laser weld joints［J］. Chinese Journal of Lasers, 2016, 43(12): 1202010.
王晓南, 郑知, 曾盼林, 等. 800 MPa级高强钢光纤激光焊接接头微观结构对硬度及疲劳性能的影响［J］. 中国激光, 2016, 43(12): 1202010.

【11】Yan Q. Study on microstructure and properties of laser welded joints for 1000 MPa grade ultra high strength CP steel［D］. Shanghai: Shanghai Jiao Tong University, 2010.
阎启. 1000 MPa级别超高强复相钢激光焊接组织及性能的研究［D］. 上海: 上海交通大学, 2010.

【12】Guo P F, Wang X N, Zhu G H, et al. Microstructures and properties of X100 pipeline steel fiber laser welding［J］. Chinese Journal of Lasers, 2017, 44(12): 1202003.
郭鹏飞, 王晓南, 朱国辉, 等. X100管线钢光纤激光焊接头的显微组织及性能［J］. 中国激光, 2017, 44(12): 1202003.

【13】Rossini M, Russo Spena P, Cortese L, et al. Investigation on dissimilar laser welding of advanced high strength steel sheets for the automotive industry［J］. Materials Science and Engineering A, 2015, 628: 288-296.

【14】Shen B L, Li L, Yue C L, et al. Summarization of relationship between tensile strength and hardness of iron-steel materials［J］. Modern Cast Iron, 2012, 32(1): 93-96.
沈保罗, 李莉, 岳昌林. 钢铁材料抗拉强度与硬度关系综述［J］. 现代铸铁, 2012, 32(1): 93-96.

【15】Jia Q, Guo W, Li W D, et al. Microstructure and tensile behavior of fiber laser-welded blanks of DP600 and DP980 steels［J］. Journal of Materials Processing Technology, 2016, 236: 73-83.

【16】Sreenivasan N. Effects of laser welding on formability aspects of advanced high strength steel［D］. Canada: University of Waterloo, 2008: 54-101.

引用该论文

Huan Pengcheng,Wang Xiaonan,Zhu Tiancai,Chen Wengang,Hu Zengrong,Zhang Min,Chen Changjun. Microstructure and Mechanical Properties of Laser Welded Joint of 800 MPa Grade Hot-Rolled High Strength Steel[J]. Chinese Journal of Lasers, 2019, 46(1): 0102002

环鹏程,王晓南,朱天才,陈文刚,胡增荣,张敏,陈长军. 800 MPa级热轧高强钢激光焊接接头的组织和力学性能[J]. 中国激光, 2019, 46(1): 0102002

被引情况

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