21-4N钢的过热与锻造裂纹  

OVERHEAT AND CRACKLE AT FORGING SURFACE OF 21-4N STEEL

作　　者：夏晓玲 

机构地区：[1]大冶钢厂钢铁研究所,435001

出　　处：《上海金属》1995年第4期27-30,共4页Shanghai Metals

摘　　要：21－4N钢在1210～1250℃加热时，不同程度地出现晶粒粗化、晶界被M2N和M7C3弱化的过热组织特征，温度愈高，过热程度愈大。过热后，不适当的锻造加工温度范围促使锻造裂纹的形成，锻造裂纹起源于锻坯表面，沿大晶粒间界扩展。The overheat structure which appears as coarse-grained texture and weakening to grain boundaries presented by M2N and M7C3 is occurred at cettain degree for a 21-4N steel heated during 1210-1250℃. The higher the temperature, the lareer the overheat dogree. Due to overheat, the forsing processing at imp:oper temperature range can impel the forming of forging crack9 which stemmed from surface of forged stock and spread along boundaries between Iarger grains.

关 键 词：晶界弱化 锻造 裂纹 钢 加热 

分 类 号：TG316.192[金属学及工艺—金属压力加工]