摘要
研究了淬火态的工程机械用1000 MPa级高强钢在不同温度回火100 min后的组织和性能.结果表明,淬火态1000 MPa级高强钢于500～750℃回火,随回火温度升高,合金组织中淬火马氏体逐渐转变为回火马氏体、回火托氏体及回火索氏体,强度和硬度逐渐下降,伸长率和低温冲击功逐渐增加.回火温度为550～650℃时,合金获得最佳的力学性能匹配.回火温度超过700℃,合金发生再结晶,生成多边形铁索体,晶界碳化物球化长大,合金强度和硬度显著降低.
Abstract
Microstructure and mechanical properties of quenched engineering mechanical 1000MPa high-strength steel with tempering at different temperature for 100 min were studied.The results show that quenched martensite transforms into tempered martensite,tempered tootsie andtempered sorbite with the increase of tempering temperature in the range of 500 to 750 ℃.The strength and the hardness decrease gradually while the elongation and the low temperature impact energy increase gradually.When tempering in 550-650 ℃,its mechanical properties are best.When tempering temperature is over 700 ℃,recrystallization occurs.The microstructure transforms into polygonal ferrite and carbides at grain boundary spheroidize and grow up.The strength and the hardness reduce significantly.
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