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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,生成多边形铁素体,晶界碳化物球化长大,合金强度和硬度显著降低。
The microstructure and properties of quenched 1000 MPa high strength steel for engineering machinery after tempering at different temperatures for 100 min were studied. The results show that the quenched 1000 MPa high strength steel is tempered at 500-750 ℃. With the increase of tempering temperature, the quenched martensite gradually changes into tempered martensite, tempered martensite and tempered wire The hardness, strength and hardness of the steel gradually decrease, and the elongation and the impact energy at low temperature gradually increase. Tempering temperature of 550 ~ 650 ℃, the alloy get the best mechanical properties match. When the tempering temperature exceeds 700 ℃, the alloy recrystallizes and produces polygonal ferrite. The grain boundary carbides grow up spherically and the strength and hardness of the alloy decrease remarkably.