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材料导报  2021, Vol. 35 Issue (16): 16133-16137    https://doi.org/10.11896/cldb.20040148
  金属与金属基复合材料 |
回火温度对42CrMo4高强钢力学性能及应力腐蚀敏感性的影响
张度宝, 李成涛, 方可伟, 罗坤杰, 王力, 武焕春, 薛飞
苏州热工研究院有限公司,苏州 215004
Effect of Tempering Temperature on Mechanical Properties and Stress Corrosion Sensitivity of 42CrMo4 High-strength Steel
ZHANG Dubao, LI Chengtao, FANG Kewei, LUO Kunjie, WANG Li, WU Huanchun, XUE Fei
Suzhou Nuclear Power Research Institute, Suzhou 215004, China
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摘要 以42CrMo4高强钢为研究对象,采用光学显微镜(OM)、慢应变拉伸(SSRT)和透射电镜(TEM)等研究了42CrMo4显微组织中碳化物形貌和分布随温度变化的情况及其对力学性能和应力腐蚀敏感性的影响。结果表明,42CrMo4高强钢在500~650 ℃回火后,组织均为回火索氏体,随着回火温度的提高,碳化物由片状不均匀分布逐渐转变为短棒状,最终呈颗粒状弥散分布于基体上;回火过程中碳化物由不均匀片状分布转变为颗粒状弥散分布是42CrMo4高强钢综合力学性能和抗应力腐蚀敏感性持续改善的主要原因。随着回火温度上升,42CrMo4高强钢0 ℃冲击韧性逐渐提高,拉伸强度逐渐降低;回火温度为500~600 ℃时,试样具有较高的应力腐蚀敏感性,且在相同热处理条件下EH(42CrMo4充氢后的脆化指数)＞ENaCl(42CrMo4在3.5%(质量分数)NaCl介质中的脆化指数),回火温度为620~650 ℃时,EH和ENaCl均低于25%,具有较低的应力腐蚀敏感性。
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张度宝
李成涛
方可伟
罗坤杰
王力
武焕春
薛飞
关键词:  42CrMo4  回火温度  金相组织  力学性能  应力腐蚀  慢应变拉伸    
Abstract: The effects of tempering temperature on the carbide morphology and distribution in 42CrMo4 microstructure and mechanical properties and stress corrosion sensitivity were researched by the optical microscopy (OM), slow strain tensile testing (SSRT) and transmission electron microscopy (TEM). The results showed that the metallographic structure of 42CrMo4 high-strength steel was tempered sorbite after tempering at 500—650 ℃, with the increase of tempering temperature, the carbide gradually changed from uneven flakes to short rods, and finally became granular and distributed dispersively on the substrate, which was the main reason for the continuous improvement of comprehensive mechanical properties and stress corrosion resistance. As the tempering temperature increased, the impact toughness of 0 ℃ of 42CrMo4 increased and the tensile strength decreased. When the tempering temperature was from 500 ℃ to 600 ℃, the samples had higher stress corrosion sensitivity and under the same heat treatment conditions, the EH＞ENaCl, when the tempering temperature was from 620 ℃ to 650 ℃, both EH and ENaCl were lower than 25%, which had lower stress corrosion sensitivity.
Key words:  42CrMo4    tempering temperature    metallographic microstructure    mechanical property    stress corrosion    slow strain tensile testing
                    发布日期:  2021-09-07
ZTFLH:  TG174  
基金资助: 国家自然科学基金青年基金(51431004);国家重点研发计划(2016YFB0700404)
通讯作者:  lichengtao@cgnpc.com.cn   
作者简介:  张度宝,2016年3月毕业于南京航空航天大学,获得工学硕士学位。毕业后加入苏州热工研究院有限公司工作至今,主要从事金属材料寿命评估工作。
李成涛,中国腐蚀与防护学会青年工作委员会委员,寿命评估副主任工程师,主要从事核电站材料高温高压环境中的腐蚀机理及安全评估研究。
引用本文:    
张度宝, 李成涛, 方可伟, 罗坤杰, 王力, 武焕春, 薛飞. 回火温度对42CrMo4高强钢力学性能及应力腐蚀敏感性的影响[J]. 材料导报, 2021, 35(16): 16133-16137.
ZHANG Dubao, LI Chengtao, FANG Kewei, LUO Kunjie, WANG Li, WU Huanchun, XUE Fei. Effect of Tempering Temperature on Mechanical Properties and Stress Corrosion Sensitivity of 42CrMo4 High-strength Steel. Materials Reports, 2021, 35(16): 16133-16137.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.20040148  或          http://www.mater-rep.com/CN/Y2021/V35/I16/16133
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