1000MPa级在线淬火钢回火工艺对屈强比的影响  

Influence of temper process on yield-tensile ratio of 1000 MPa grade plate produced by direct quenching

作　　者：张云燕[1,2] 刘静[1] 王世森[2] 李德发[2] 陈洪伟[2] 黄静[2] 

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

出　　处：《钢铁研究》2012年第6期37-39,共3页Research on Iron and Steel

摘　　要：将20mm厚1 000MPa级钢板在线淬火后进行不同温度的回火处理,观察了组织及屈强比的变化。结果表明:回火区间在400～550℃范围,屈强比从0.81增长到0.93;回火区间在550～650℃范围,屈强比从0.93降低到0.88。试验钢单相回火索氏体组织屈强比最高,屈强比上升按组织形貌排序为:回火贝氏体加回火马氏体、回火贝氏体加回火索氏体、回火索氏体。Yield-tensile ratio of 1 000 MPa grade plate with a thickness of 20 mm produced with direct quenching technology is studied in this paper. The plate was on-line quenched and then tempered in different temperatures. The changes of microstructure and yield-tensile ratio were observed. The results showed that the yield-tensile ratio of plate increased from 0. 81 to 0. 93 with temper temperature rising in 400-550 ℃ but it decreased from 0. 93 to 0.88 with temper temperature rising in 550-650℃. The plate with tempered sorbite was highest in yield-tensile ratio. The yield-tensile ratio of plates with different microstructures increased in the following order： plate with tempered bainite and tempered martesite, plate with tempered bainite and tempered sorbite, plate with tempered sorbite.

关 键 词：在线淬火 回火工艺 高强钢 屈强比 

分 类 号：TG156.5[金属学及工艺—热处理]