淬火加热方法对含铜高强度球扁钢组织和性能的影响  

Effect of Methods of Heating for Hardening on Microstructure and Properties of Cooper-bearing High-strength Flat Bulb Steel

作　　者：陈晨[1,2] 罗小兵 梁丰瑞[2] 杨丽[2] 刘宁 CHEN Chen;LUO Xiaobing;LIANG Fengrui;YANG Li;LIU Ning(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,Anhui China;Department of Structural Steels,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]钢铁研究总院工程用钢所,北京100081

出　　处：《热处理》2021年第3期31-36,54,共7页Heat Treatment

基　　金：国家重点研发项目“热处理过程材料性能场预测及工艺优化”(2017YFB0701804)。

摘　　要：对含0.06%C,1.50%~2.0%Ni,0.83%Cr,1.20%~1.50%Cu和0.20%Mo(质量分数)的高强度球扁钢分别采用感应加热和传统炉子加热至980℃水淬和680℃回火。检测了热处理后钢的屈服强度、-40℃冲击韧度和显微组织,以确定淬火加热方法对球扁钢组织和力学性能的影响。结果表明:感应加热淬火调质的球扁钢屈服强度高于传统炉子加热淬火调质的钢;感应加热淬火调质的钢有效晶粒平均尺寸为3.23μm,而传统炉子加热淬火调质的钢为4.29μm;钢中富铜析出相粒子主要分布于贝氏体板条界面和位错线附近,感应加热淬火调质的钢富铜析出相粒子尺寸为(36.70±13.50)nm,而传统炉子加热淬火调质的钢为(25.72±7.5)nm;感应加热和炉子加热淬火调质的球扁钢强化机制主要为细晶强化,前者的位错强化效果优于后者,而析出强化的效果则相反。High-strength flat bulb steel containing 0.06%C,1.50%to 2.0%Ni,0.83%Cr,1.20%to 1.50%Cu,and 0.20%Mo was respectively heated by induction and by common furnace then water quenched and tempered at 680℃.After the steel being heat treated,the yield strength and-40℃impact toughness were measured,the microstructure was surveyed,to identify the effect of the method of heating for hardening on structure and mechanical properties of the bulb steel.The results show that(a)the bulb flat steel heated by induction then quenched and high-temperature tempered is superior to the steel heated by common furnace then quenched and high-temperature tempered in yield strength;(b)average size of effective grains is 3.23 μm for the steel heated by induction then quenched and high-temperature tempered and 4.29 μm for the steel heated by common furnace then quenched and high-temperature tempered;(c)cooper-rich precipitate particles were mostly distributed at bainite lath interface and near dislocation line in the steel,and their size is(36.70±13.50)nm in the steel heated by induction then quenched and high-temperature tempered and(25.72±7.50)nm in the steel heated by common furnace then quenched and high-temperature tempered;and(d)the bulb flat steel heated by induction and by common furnace then quenched and high-temperature tempered is strengthened by grain refining,the former is superior to the latter in result of strengthening by dislocation,however,the precipitation strengthening result is opposite.

关 键 词：富铜析出相 高强度球扁钢 感应加热 强化 

分 类 号：TG156.31[金属学及工艺—热处理]