高韧性铝硅镀层热成形钢电阻点焊性能研究  

Study on Resistance Spot Welding Performance of Al-Si Coated Press Hardening Steels with High Toughness

作　　者：李峥先 程菲 陈仪霖 杨达朋 易红亮[1,2] Li Zhengxian;Cheng Fei;Chen Yilin;Yang Dapeng;Yi Hongliang(Northeastern University,State Key Laboratory of Rolling and Automation,Shenyang 110819;Easyforming Materials Technology Co.,Ltd.,Suzhou 215123)

机构地区：[1]东北大学,轧制技术及连轧自动化国家重点实验室,沈阳110819 [2]育材堂(苏州)材料科技有限公司,苏州215123

出　　处：《汽车工程》2025年第2期367-375,共9页Automotive Engineering

基　　金：国家自然科学基金(52101128);中国博士后科学基金(2022M710021)资助。

摘　　要：镀层厚度在8~18μm的铝硅镀层热成形钢具有更高的韧性,已在汽车行业引起广泛关注。然而,对于减薄镀层后的铝硅镀层热成形钢的电阻点焊性能评价却较少。本文对比了强度级别分别为1 000、1 500和2 000 MPa的薄铝硅镀层热成形钢的焊接性能。研究发现,3种材料的可焊性电流范围及焊点的力学性能均能够满足生产需求。进一步分析发现,焊点力学性能和熔核区马氏体的强度和韧性有关。随着3种材料强度提高,熔核区马氏体的强度(硬度)增加,韧性降低,拉剪极限载荷随焊点强度提升而增大,而十字拉伸极限载荷随着焊点韧性降低而减小。Al-Si coated press hardening steels(PHS)with coating thicknesses ranging from 8 to 18µm demonstrate enhanced toughness,drawing significant attention from the industry.However,there is limited evalua-tion of the resistance spot welding performance of Al-Si coated PHS with reduced coating thickness.This research compares the weldability of PHS with thin Al-Si coatings at strengths of 1000,1500,and 2000 MPa.The results show that the weldability current range and mechanical properties of welds for all three grades of PHS meet industri-al production requirements.Further analysis reveals that the mechanical properties of the welds are closely linked to the strength and toughness of the martensite in the nugget.As the matrix strength increases,the strength(hardness)of the martensite in the nugget also rises,while toughness decreases.Consequently,the tensile-shear ultimate load increases with rising weld strength,whereas the cross-tensile ultimate load decreases as weld toughness diminishes.

关 键 词：Al-Si镀层 热成形钢 电阻点焊 可焊窗口 组织和性能 

分 类 号：TG1[金属学及工艺—金属学]