两相区淬火温度对HSLA100钢显微组织及屈强比的影响  

Effect of Two-Phase Region Quenching Temperature on Microstructure and Yield Ratio of HSLA100 Steel

作　　者：严翔[1,2] 周桂峰[2] 陈玮[2] 刘武群[2] 

机构地区：[1]武汉科技大学材料与冶金学院,武汉430081 [2]武汉钢铁(集团)公司研究院,武汉430080

出　　处：《机械工程材料》2012年第10期34-37,共4页Materials For Mechanical Engineering

摘　　要：研究了HSLA100钢在两相区二次淬火时淬火温度对组织和屈强比的影响。结果表明:HSLA100钢在两相区二次淬火后形成了铁素体和M/A岛的混合组织;700℃淬火时,沿板条状铁素体分布着少量岛状组织;随淬火温度的升高,岛状组织数量增多且粗化,同时铁素体形貌从单一的板条状逐渐向多边形状转变,且其中的位错密度降低;当淬火温度升到820℃时,其显微组织又恢复到板条贝氏体;试验钢的屈强比在700～740℃温度范围内从0.94持续下降至0.67,而在740～780℃区间内波动很小(约为0.67),当温度超过780℃后又大幅上升。Effects of secondary quenching temperature on microstructure and yield ratio of HSLA （high strength low alloy） 100 steel in the two-phase region were investigated. The results show that the mixed microstructure of ferrite and the M-A （martensite-austenite） islands were obtained in the two-phase region after secondary quenching. A small amount of island structure distributing along the lath ferrite was observed when quenching temperature was 700 ℃. With the increase of quenching temperature the island structure increased in the number and coarsened in the shape, and the ferrite morphology gradually changed from a single lath to the multilateral shape with the decrease of the dislocation density. When quenching temperature was 820 ℃, the microstrueture reverted to lath bainite. The yield ratio of the test steel continually declined from 0. 94 to 0. 67 in the range of quenching temperature from 700 ℃ to 740 ℃, but kept a very small fluctuation in the range of 740-780 ℃（about O. 67）, and finally raised sharply at quenching temperatures above 780 ℃.

关 键 词：HSLA100钢 两相区淬火 屈强比 显微组织 

分 类 号：TG580.64[金属学及工艺—金属切削加工及机床] TG156.33