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热处理参数对40CrNiMo钢硬度和韧性的影响

Effect of Heat Treatment on Hardness and Toughness of 40CrNiMo Steel

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【作者】 梅珍蒋波董正强周乐育张朝磊刘雅政

【Author】 Mei Zhen;Jiang Bo;Dong Zhengqiang;Zhou Leyu;Zhang Chaolei;Liu Yazheng;School of Materials Science and Engineering, University of Science and Technology Beijing;

【机构】 北京科技大学材料科学与工程学院

【摘要】 本文通过热处理实验,结合光学显微镜、SEM扫描电镜观察、硬度测试及冲击功测试,研究了不同淬火和回火温度下40Cr Ni Mo钢布氏硬度和-20℃冲击功的变化特点。结果表明:回火温度为625℃时,随着淬火温度由800℃升高到875℃,实验钢回火硬度由273HB逐渐增加到289HB,淬火温度继续升高,硬度下降;冲击功在淬火温度为800℃时最高,为127J,淬火温度继续升高,冲击功逐渐下降但不明显。淬火温度一定,为800℃时,随着回火温度由500℃升高到650℃,回火硬度逐渐降低,冲击功逐渐增加,回火温度为650℃时,回火硬度最低,为280HB,冲击功最高,为137J,断口形貌由小且浅韧窝向大且深韧窝转变。随着回火温度的降低,马氏体发生回复和再结晶程度增加,马氏体原始位相逐渐消失,碳化物逐渐析出并长大,影响硬度和冲击功的主要因素是马氏体基体的软化作用。综合研究,回火温度是影响实验钢硬度和冲击功的主要参数,淬火温度影响不明显。

【Abstract】 Effect of quenching and tempering temperature on Brinell Hardness and-20 oC impact energy of steel 40 Cr Ni Mo was investigated by heat treatment experiment, optical microscope, scanning electron microscope, hardness test and impact test. Results show that when tempering temperature is 625 oC, the tempered hardness of steel 40 Cr Ni Mo rises from 273 HB to 289 HB as the quenching temperature increases from 800 oC to 875 oC, and decreases as the quenching temperature continues to increase. The impact energy decreases from 127 J to 113 J with the increasing quenching temperature incrementally. When quenching temperature is 800 oC, hardness presents a downward trend, and impact energy shows a rise with the tempering temperature increasing from 500 oC to 650 oC. Tempered sorbite and carbide morphology and distribution are the main factors affecting the hardness and impact energy. Comprehensively, effect of tempering temperature on hardness and impact energy of 40 Cr Ni Mo is more obvious than that of quenching temperature.

【基金】 “十二五”国家863计划项目“重大装备用轴承钢关键技术开发”(2012AA03A503)
  • 【会议录名称】 “第十届中国钢铁年会”暨“第六届宝钢学术年会”论文集
  • 【会议名称】“第十届中国钢铁年会”暨“第六届宝钢学术年会”
  • 【会议时间】2015-10-21
  • 【会议地点】中国上海
  • 【分类号】TG161;TG142.1
  • 【主办单位】中国金属学会(The Chinese Society for Metals)、宝钢集团有限公司(Baosteel Group Coporation)
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