回火温度对易焊接80kg级高强钢组织和力学性能的影响
Effects of Tempering Temperature on Microstructure and Mechaical Properties of 80 kg Grade High Strength Steel for Easy Welding
刘丹 1陈杰 2靳东 2张青学1
作者信息
- 1. 湖南华菱湘潭钢铁有限公司,湖南 湘潭 411101
- 2. 中南大学 材料科学与工程学院,湖南 长沙 410083
- 折叠
摘要
研究了不同回火温度对 80 kg级直接淬火钢组织和性能的影响.结果表明:直接淬火钢具有较高的强韧性组合和高温回火抗性,当回火温度在 450～650℃时,试验钢仍然保持板条状马氏体的形状和位向,随着回火温度升高,板条发生粗化,伴随着残余奥氏体的分解和碳化物的析出和长大等过程.当回火温度为 700℃时,试验钢发生较高程度的再结晶,性能明显恶化.当回火温度为 650℃时,试验钢具有最佳的综合力学性能,屈服强度为 795 MPa,抗拉强度为821 MPa,断后伸长率为 20.6%,标准试样-20℃冲击功为 195 J.
Abstract
Effects of different tempering temperatures on the microstructure and properties of 80 kg direct quenched steel were studied.The results show that the direct quenched steel has high strength and toughness combination and high temperature tempering resistance.When the tempering temperature is 450-650℃,the test steel still maintains the shape and orientation of the lath martensite.With the increase of tempering temperature,the slab coarsening occurs,accompanied by the decomposition of retained austenite and the precipitation and growth of carbide.At the tempering temperature of 700℃,a high degree of recrystallization occurs in the test steel,and the properties deteriorate obviously.When the tempering temperature is 650℃,the test steel has the best comprehensive mechanical properties,the yield strength is 795 MPa,the tensile strength is 821 MPa,the elongation after break is 20.6%,and the impact work of the standard sample at-20℃is 195 J.
关键词
高强钢/回火温度/显微组织/力学性能/易焊接Key words
high strength steel/tempering temperature/microstructure/mechanical properties/easy to weld引用本文复制引用
基金项目
湖南省省级科技计划(2018XK2301)
出版年
2024
NETL
NSTL
万方数据