7CrMn2Mo钢的球化退火工艺  

Spheroidizing annealing process of 7CrMn2Mo steel

作　　者：李冬丽[1,2] 马党参[2] 陈再枝[2] 计辉[1,2] 刘宝石 康爱军 詹肇麟[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院,北京100081 [3]东北特殊钢集团,辽宁抚顺113001

出　　处：《金属热处理》2010年第11期57-61,共5页Heat Treatment of Metals

摘　　要：研究了7CrMn2Mo钢的常规的球化退火和正火+球化退火工艺球化退火行为。结果表明,该钢退火前必须正火;与连续退火、等温退火相比,亚温球化退火的碳化物球化速度较快,效果较好;采用720℃保温48 h,达到球化等级要求。相分析结果表明,此钢退火态的碳化物主要为M23C6和小部分M3C及其它类型的碳化物。Behavior of spheroidizing annealing of 7CrMn2Mo steel was studied with conventional spheroidizing annealing and normalizing ＋ spheroidizing annealing.Results show that 7CrMn2Mo steel must be normalized before annealing;compared of continuous annealing and isothermal annealing,carbides spheroidization occurs more rapidly and the effect is better with subcritical annealing process.The spheroidization grade requirement of 7CrMn2Mo steel can be achieved with annealing at 720 ℃ for 48 h.Phase analysis results show that the carbides in annealed 7CrMn2Mo steel are mainly M23C6,a few of M3C and other types of carbides.

关 键 词：球化退火 正火 7CrMn2Mo钢 亚温球化退火 碳化物 

分 类 号：TG142.45[一般工业技术—材料科学与工程]