摘要
研究了等温转变温度对75Si2CrMn钢无碳化物贝氏体组织形态及其对力学性能的影响。结果表明,在280～330℃范围内的转变产物为薄膜状奥氏体与细片状贝氏铁素体的细小层片状双相组织。它同时具有很高的屈服强度、韧性和加工硬化能力。而转变温度由330℃提高到350℃后,转变产物则为粗大贝氏铁素体团块,分布于奥氏体基体中的双相组织。同时,其力学性能,尤其是韧性发生突然下跌。因此,若获得综合力学性能优异的组织,则等温淬火温度不能高于330℃。
The effect of austempering teperature on bainitic microstructures and mechanical properties of steel 75Si2CrMn was studied in this paper. Resuits showed that at the range of 280～330°C a fine lamellar dual-phase stucturc of film austenite and bainitic-ferrite plate was formed. It has high yield strength, toughness as well as work hardening ability simultaneously, At 350°C austemperiag a coarse dual-phase structure, bloch bainilic ferrile dispersed on austenite matrix, was produced whose mechanical properties, especially toughness and ductility, become very poor. So in order to get excellent comprehensive properties the austempering temperature for this steel shuld not over 330°C.
出处
《金属热处理》
CAS
CSCD
北大核心
1991年第4期40-44,共5页
Heat Treatment of Metals
