预淬火对冷轧Fe-0.15C-7Mn钢板力学性能的影响  

Effect of Prehardening on Mechanical Properties of Cold-Rolled Fe-0.15C-7Mn Steel Sheet

作　　者：张洁 岑琼瑛 汪杨 张梅[1] ZHANG Jie;CEN Qiongying;WANG Yang;ZHANG Mei(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2023年第1期73-78,共6页Shanghai Metals

摘　　要：对1.5 mm厚的冷轧Fe-0.15C-7Mn钢板分别进行了630℃保温1、2、4和8 h空冷的临界退火及800℃奥氏体化30 min水淬,然后按同样工艺进行临界退火。检测了钢板的显微组织、力学性能和吕德斯应变分布。结果表明:仅经临界退火的试验钢板显微组织主要呈等轴状,而800℃水淬后临界退火的钢板显微组织主要呈板条状;经630℃保温1 h临界退火的钢板力学性能优异,强塑积高达37 GPa·%,但有明显的吕德斯带;经800℃水淬后630℃保温4 h临界退火的钢板强塑积高达38 GPa·%,吕德斯带完全被消除。1.5-mm-shick cold-rolled Fe-0.15C-7Mn steel sheet was intercritically annealed at 630℃for 1,2,4 and 8 h and air cooled,as well as was austenitized at 800℃for 30 min and water quenched and then intercritically annealed by the same processes,respectively.After this,the steel sheet was tested for microstructure,mechanical properties and Lüders strain distribution.The results showed that(a)the microstructures were largely in equiaxed form in the test steel sheet intercritically annealed alone,and largely in the form of lath in the steel sheet water quenched from 800℃and then intercritically annealed;(b)the steel sheet intercritically annealed at 630℃for 1 h exhibited excellent mechanical properties,and as high product of tensile strength and elongation as 37 GPa·%,but had obvious Lüders bands;and(c)the steel sheet water quenched from 800℃and then intercritically annealed at 630℃for 4 h displayed as high product of tensile strength and elongation as 38 GPa·%,and no the Lüders bands.

关 键 词：中锰钢 预淬火 临界退火 吕德斯带 力学性能 

分 类 号：TG142.33[一般工业技术—材料科学与工程]