摘要
借助光学显微镜、扫描电镜、拉伸试验机等研究了热处理工艺对自主设计的新型高强、高韧、无Ni低温油井管用钢（简称IMR-LS10钢）组织和性能的影响。结果表明：在800～880℃淬火时,随着淬火温度的升高,IMR-LS10钢的平均晶粒尺寸先增大后减小,经650℃回火后的抗拉强度逐渐增大,-45℃低温冲击吸收能量先增大再减小,840℃淬火时达到峰值38.6 J;在880～1000℃淬火时,随着淬火温度的增加,IMR-LS10钢的晶粒尺寸逐渐增大,经650℃回火后的抗拉强度先减小再增大,低温冲击吸收能量逐渐增大;经880℃淬火＋200～750℃回火后IMR-LS10钢抗拉强度逐渐降低;回火温度低于500℃时,IMR-LS10钢的低温冲击吸收能量缓慢增加,当回火温度达到550℃时,低温冲击吸收能量达到峰值32.98 J,随后,低温冲击吸收能量出现降低趋势,并在650℃时出现最小值;IMR-LS10钢的最佳调质热处理工艺方案为880℃淬火＋550℃回火。
The effect of heat treatment on microstructure and mechanical properties of a new high-strength high-toughness Ni-free lowtemperature oil well steel（ IMR-LS10 steel） was investigated by means of optical microscope,scanning electron microscopy and tensile testing machine. The results show that in the quenching temperature range of 800-880 ℃,the average prior austenitic grain size of the IMR-LS10 steel first increases then decreases with the increasing of quenching temperature. After tempering at 650 ℃,the tensile strength of the steel increases gradually and the low temperature impact absorption energy at-45 ℃ increases first to a peak value of 38. 6 J at840 ℃ and then decreases. In the quenching temperature range of 880-1000 ℃,the average prior austenitic grain size of the IMR-LS10 steel increases gradually with the increasing of quenching temperature. After tempering at 650 ℃,the low temperature impact absorption energy decreases gradually,and the tensile strength decreases to a valley value and then increases gradually after quenching at 920 ℃.After quenching at 880 ℃ and tempering at 200-750 ℃,the tensile strength of the steel shows a decreasing tendency except a slight rise at 350 ℃ with the increasing of tempering temperature. When the tempering temperature is lower than 500 ℃,the low temperature impactabsorption energy increases slowly,and when the tempering temperature reaches 550 ℃,the low temperature impact absorption energy reaches a peak value of 32. 98 J. Subsequently,the low temperature impact absorption energy decreases and the minimum value appears at650 ℃. The optimal heat treatment process for the steel is quenching at 880 ℃ and tempering at 550 ℃.
作者
易善伟
历长云
胡小强
刘宏伟
郑雷刚
米国发
许敬月
秦卓
赵子文
YI Shan-wei;LI Chang-yun;HU Xiao-qiang;LIU Hong-wei;ZHENG Lei-gang;MI Guo-fa;XU Jing-yue;QIN Zhuo;ZHAO Zi-wen(College of Material Science and Engineering, Henan Polytechnic University,Jiaozuo 454000, China;Institute of Metal Research （IMR） , Chinese Academy of Sciences, Shenyang 110016, China;Lanzhou LS Energy Equipment Engineering Institute Co Ltd, Lanzhou 730314, China;Gansu Engineering Technology Research Center of High-end Castings and Forgings, Lanzhou 730314, China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2018年第6期68-75,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(U1508215)
甘肃省科技攻关计划(2015GS05896)
辽宁省科技创新重大专项(201410003)
关键词
油井管
淬火温度
回火温度
抗拉强度
冲击吸收能量
oil-well tube
quenching temperature
tempering temperature
mechanical property
tensile strength
impact absorption energy
