过时效温度对1.2 GPa高强钢组织与性能的影响  

Effect of over-aging temperature on microstructure and properties of 1.2 GPa high strength steel

作　　者：武鑫 张洪杰[2] 王玉慧 艾兵权 李浩[2] 顾明磊 李健[1] Wu Xin;Zhang Hongjie;Wang Yuhui;Ai Bingquan;Li Hao;Gu Minglei;Li Jian(Quality Management Department,Tangshan Iron&Steel Group Co.,Ltd.,Tangshan Hebei 063000,China;Technical Center,Tangshan Iron&Steel Group Co.,Ltd.,Tangshan Hebei 063000,China)

机构地区：[1]唐山钢铁集团有限责任公司质量管理部,河北唐山063000 [2]唐山钢铁集团有限责任公司技术中心,河北唐山063000

出　　处：《金属热处理》2025年第4期223-226,共4页Heat Treatment of Metals

摘　　要：利用Gleeble-3800热模拟试验机对C-Si-Mn-Cr-Mo-B系1.2 mm厚1.2 GPa级高强钢冷硬态原料开展不同过时效温度试验,重点研究不同过时效温度对其力学性能与组织的影响规律。结果表明:过时效温度为260~340℃时,随过时效温度升高,抗拉强度单调下降,屈服强度及屈强比单调提升,断后伸长率变化规律不明显;快冷温度联动升高,冷却过程的过冷度降低,进而马氏体含量逐渐降低甚至晶粒内部出现白色粒状第二相析出,浮凸特征逐渐弱化,大角度晶界逐渐变多,铁素体晶粒内部(Fe,Mn)_(x)C_(y)析出相量逐渐减少。退火温度为800℃、过时效温度为280℃试制工艺下,成品力学性能满足国标要求,成功应用于前保险杠横梁的辊压成形。Using the Gleeble-3800 thermal simulation experimental machine,different over-aging temperature tests of 1.2 mm thick 1.2 GPa high-strength steel bearing C-Si-Mn-Cr-Mo-B were conducted on the cold-rolled hardening raw materials and the research of influencing law about different over-aging temperatures on mechanical properties and microstructure was focused on.The results show that,in the range of 260-340℃,as the over-aging temperature increases,the tensile strength monotonically decreases,while the yield strength and yield ratio monotonically increase,and the change in elongation after fracture is not obvious.Meanwhile,as the rapid cooling temperature increases with the aging temperature,the degree of undercooling during the cooling process decreases,resulting in the gradually decreases of martensite content,and even white granular second phase precipitates inside the grain and the convex features of martensite gradually weaken,and the large angle grain boundaries gradually increase.The amount of(Fe,Mn)_(x)C_(y) precipitates inside the ferrite grains gradually decreases.Under the trial production process with an annealing temperature of 800℃and an over-aging temperature of 280℃,the mechanical properties of the finished product meet the national standard requirements.It is successfully applied to the roll forming of the front bumper crossbeam.

关 键 词：1.2 GPa高强钢 过时效温度 力学性能 组织 工业试制 辊压成形 

分 类 号：TG156.2[金属学及工艺—热处理]