DT300钢软化退火中的组织与性能研究  

Study on Microstructure and Property of DT300 Steel in Softening Annealing

作　　者：赵磊[1] 刘宪民[2] 雍岐龙[1] 王春旭[2] 

机构地区：[1]昆明理工大学材料与冶金学院,云南昆明650093 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《热加工工艺》2007年第2期49-51,共3页Hot Working Technology

摘　　要：在略低于Ac_1的温度对试验钢进行退火加热,由于铁、碳等元素的扩散,α相通过回复、再结晶形成多边形的铁素体,渗碳体不断聚集、长大成粗粒状,渗碳体的球化成为软化的主要因素。研究结果表明,进行660℃×20h,炉冷至小于300℃空冷的退火处理,可获得良好的机械加工性能,既经济又实效。DT300 steel was carded out annealing below ,Ac1 a little.The α phase formed polygonal ferrite through reversion and recystallization, and cementite assembled and grew up into coarse grain because Fe and C elements got diffusion enough.Spheroidization of cementite is the main factor in softening.The results show that excellent machining properies are obtained under the condition of annealing at 660℃ ×20 h followed furnace cool until 300 ℃ ,which is economic and effective.

关 键 词：DT300 正火 退火 硬度 微观组织 

分 类 号：TG156.21[金属学及工艺—热处理]