合金元素含量对汽车大梁用610L钢组织与性能的影响  

Effect of alloying element content on microstructure and mechanical properties of 610L steel for automobile beam

作　　者：杨文卿 师可新[3] 董军海 孙胜辉 蔡明晖 张晓明[4] 丁桦[1,2,4] Yang Wenqing;Shi Kexin;Dong Junhai;Sun Shenghui;Cai Minghui;Zhang Xiaoming;Ding Hua(School of Materials and Science Engineering,Northeastern University,Shenyang Liaoning 110819,China;Key Lab of Lightweight Structural Materials of Liaoning Province,Northeastern University,Shenyang Liaoning 110819,China;Tangshan Stainless Steel Co.,Ltd.,Tangshan Hebei 063000,China;State Key Lab of Rolling and Automation,Northeastern University,Shenyang Liaoning 110819,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]东北大学辽宁省轻量化用关键金属结构材料重点实验室,辽宁沈阳110819 [3]唐山不锈钢有限责任公司,河北唐山063000 [4]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《金属热处理》2023年第1期40-46,共7页Heat Treatment of Metals

摘　　要：采用“调Si、降Nb、加Ti”的合金设计理念,结合优化的控轧控冷工艺,开发出一种新型汽车大梁用610 MPa级Ti-Nb-Si系低碳微合金钢。结果表明,当Si、Nb和Ti的质量分数分别为0.04%、0.03%和0.06%时,试验钢在热轧后水冷(15~20℃/s)至卷取温度时的显微组织为铁素体+珠光体,且在铁素体基体内分布着高密度的纳米析出相,综合力学性能较好,屈服强度为539 MPa,抗拉强度为633 MPa,伸长率为20.5%,扩孔率为66.4%,各项力学性能和扩孔性能均满足汽车大梁用610L钢的性能要求。A new type of 610 MPa grade Ti-Nb-Si microalloyed low carbon steel for automotive beam was designed based on the alloy design concept of increasing Si slightly,reducing Nb and raising Ti,combining with optimizing the thermo-mechanical control process(TMCP)parameters.The results show that the microstructure of the steel with 0.04%Si,0.03%Nb and 0.06%Ti water cooled(15-20℃/s)to the coiling temperature after hot rolling is ferrite+pearlite,with high density nano-precipitates distributing in the ferrite matrix,exhibiting a good comprehensive properties with the yield strength of 539 MPa,the tensile strength of 633 MPa,the elongation of 20.5%and the hole expansion ratio of 66.4%,all meeting the requirements of both the mechanical properties and the hole expansion formability of 610L steel.

关 键 词：汽车大梁钢 微合金化 控轧控冷 组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]