摘要
研究了正回火温度对低合金铸钢显微组织及力学性能的影响。结果表明,铸钢正火后的组织为贝氏体型铁素体,890℃正火钢的硬度最大。铸钢经890℃正火,500~650℃回火后,组织转变为保留贝氏体痕迹的索氏体和铁素体;随回火温度升高,钢的硬度和抗拉强度先增大后减小,伸长率先减小后增加。890℃正火,560~590℃回火后钢具有较优的综合力学性能。
Effects of normalizing and tempering temperature on the microstracture and mechanical properties of low alloy cast steel were investigated by means of metallographic structure analysis and mechanical property testing. The results show that the microstrucmre of the low alloy steel after normalizing transforms from bulky pearlite and ferrite into bainite and ferrite. The steel normalized at 890 ℃has the highest hardness. The microstrucmre becomes sorbite and ferrite which keep bainite traces when the steel is tempered at 500-650 ℃. With the increase of the tempering temperature, the hardness and tensile strength of the steel increase firstly and then decrease. The steel tempered at 560-590 ℃ owns the best comprehensive mechanical properties.
作者
王佐铭
WANG Zuoming(School of Mechanical Engineering, Weifang University of Science and Technology, Weifang 262700, Chin)
出处
《铸造技术》
CAS
北大核心
2017年第4期843-846,共4页
Foundry Technology
关键词
正火处理
回火处理
铸钢
显微组织
力学性能
normalizing treatment
tempering treatment
cast steel
microstrucmre
mechanical properties
