摘要
针对高强钢淬火处理后强度高、塑性低问题,采取Q&P处理,降低部分强度,大幅度提高伸长率,从而提高强塑积。结果表明:原材料组织为铁素体+珠光体,材料经过配分后组织转变为马氏体+残余奥氏体。当配分温度一定时,高强钢强度会随着配分时间增加而上升,但是伸长率会随着配分时间增加而下降;当配分时间一定时,高强钢强度会随着配分温度的增加而下降,但是伸长率会随着配分温度的增加而上升。材料在配分温度260℃、配分时间12 s时,强塑积为17.20 GPa·%,材料强塑积达到最大。淬火试样组织基本为全马氏体,经过组织转变材料强度大幅度提高但伸长率过低;Q&P试样使碳从过饱和板条马氏体中脱附溶解到奥氏体中,增加基体中残余奥氏体的稳定性直至室温,从而提高残余奥氏体在材料中的含量,可以做到降低部分强度,大幅提高伸长率,提高强塑积。
Q&P treatment is adopted to address the problems of high strength and low plasticity of high-strength steel after quenching treatment,reducing some strength and significantly increasing elongation,thereby improving the strength plasticity product.The results show that the raw material structure consists of ferrite and pearlite,and after partitioning,the structure transforms into martensite and residual austenite.When the partitioning temperature is constant,the strength of high-strength steel increases with the increase of partitioning time,but the elongation will decrease with the increase of partitioning time.When the partitioning time is constant,the strength of high-strength steel decreases with the increase of partitioning temperature,but the elongation increases with the increase of partitioning temperature.At a partitioning temperature of 260℃and a partitioning time of 12 s,the strength plastic product of the material is 17.20 GPa·%,reaching its maximum strength plastic product.The microstructure of the quenched sample is basically full martensite,and after the microstructure transformation,the material strength is greatly improved but the elongation is too low;Q&P sample makes carbon desorb and dissolve from supersaturated lath martensite to austenite,increasing the stability of residual austenite in the matrix to room temperature,thus increasing the content of residual austenite in the material,which can reduce part of the strength,greatly increase the elongation,and thus improve the strength plastic product.
作者
黄伟
黄莉
梁肖
邓建林
王子健
罗模芳
HUANG Wei;HUANG Li;LIANG Xiao;DENG Jianlin;WANG Zijian;LUO Mofang(Jiangxi Hot Stamping Automotive Component Co.,Ltd.,Jiujiang 332400,China;Zhengzhou Nissan Automobile Co.,Ltd.,Zhengzhou 450000,China;Soochow University,Suzhou 215031,China)
出处
《热加工工艺》
北大核心
2025年第22期98-102,共5页
Hot Working Technology
基金
国家自然科学基金青年基金项目(51905189)
国家科技重大专项项目(2018ZX04023001)。
关键词
高强度热成形钢
Q&P
强塑积
high strength hot stamped steel
Q&P
strength plastic product
