回火温度对Q960E高强钢组织和性能的影响
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摘要
对尺寸为100 mm×400 mm×16 mm的Q960E高强钢试样进行了920℃水淬,然后分别于580℃、600℃和620℃回火,以研究回火温度对该钢的显微组织和力学性能的影响。结果表明,随着回火温度的提高,钢板强度逐渐下降但均满足标准要求,回火组织为索氏体组织。当600℃回火时,屈服强度为1 001 MPa,抗拉强度为1 038 MPa,断后伸长率达到了15.0%,-40℃纵向冲击吸收能量平均达到了59 J,为最优的强、韧性。考虑到钢的焊接工艺,淬火后Q960E高强钢应在600℃而不是在580℃或620℃回火。
Q960E High Strength Steel samples,100 mm wide by 400 mm long by 16 mm thick,were austenitized at 920 ℃,quenched in water,and then separately temped at 580 ℃,600 ℃ and 620 ℃ in proper order,to reveal the effect of tempering temperature on the microstructure and properties of this steel.The results show that as the tempering temperature rises from 580 to 620 ℃,the strength decreases but conforms with the requirements,and that microstmcture of the steel after tempering is sorbite.After being tempered at 600 ℃,the steel exhibited yield strength of 1 001 MPa,tensile strength of 1 038 MPa,elongation of 15.0%,and average longitudinal impact absorption energy at- 40 ℃ of 59 J,with both the strength and toughness being the best.Taking the welding practipe into considreation,after quenching the Q960 E steel should be tempered at 600 ℃ rather than 580 ℃ or620 ℃.
Q960E High Strength Steel samples,100 mm wide by 400 mm long by 16 mm thick,were austenitized at 920 ℃,quenched in water,and then separately temped at 580 ℃,600 ℃ and 620 ℃ in proper order,to reveal the effect of tempering temperature on the microstructure and properties of this steel.The results show that as the tempering temperature rises from 580 to 620 ℃,the strength decreases but conforms with the requirements,and that microstmcture of the steel after tempering is sorbite.After being tempered at 600 ℃,the steel exhibited yield strength of 1 001 MPa,tensile strength of 1 038 MPa,elongation of 15.0%,and average longitudinal impact absorption energy at- 40 ℃ of 59 J,with both the strength and toughness being the best.Taking the welding practipe into considreation,after quenching the Q960 E steel should be tempered at 600 ℃ rather than 580 ℃ or620 ℃.
引文
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[3]刘丽华.高强板生产中不同淬火工艺的分析研究[J].上海金属,2014,36(1):51-54.
[4]粱宝珠,洪君,刘孟启.中国、欧洲压力容器用钢板标准浅析[J].鄂钢科技,2012(4):46-50.
[5]郑建平,侯中华,廖仕军,等.拉伸时分层的Q690D钢板试样的显微组织研究[J].热处理,2012,27(5):30-33.
[6]付转,张利民,武鸿谦.Q690高强板焊接工艺研究及应用[J].煤矿机械,2012(3):114-116.
[7]郑建平,黄贞益,苑阳阳,等.超低碳低屈服点钢组织与性能研究[J].热处理,2015,30(3):6-9.