热处理温度对Cr-Ni-Mo-V钢组织和力学性能的影响
Effect of heat treatment temperature on microstructure and mechanical properties of Cr-Ni-Mo-V steel
查看参考文献21篇
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文摘
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利用OM、SEM和TEM等研究了热处理温度(正火温度、淬火温度和回火温度)对Cr-Ni-Mo-V钢微观组织和力学性能的影响。结果表明:在840 ~ 920 ℃的正火温度和淬火温度范围内,合金钢的原奥晶粒尺寸变化不大(8 ~ 17 μm),对最终回火态合金钢的力学性能影响较小。随着回火温度(460 ~ 660 ℃)的升高,基体α-Fe的板条宽度从460 ℃的50 nm逐渐增加到610 ℃的500 nm,直至660 ℃板条特征不明显;与此同时,基体α-Fe逐渐分解析出较粗大(500 ~ 1000 nm)的条状碳化物,使得Cr-Ni-Mo-V钢的强度逐渐降低,而在510 ~ 560 ℃析出了细小弥散的针状碳化物(50 ~ 500 nm)和球状碳化物(<50 nm),引起了二次硬化,使得合金钢的强度反而略有增加。此外,合金钢的伸长率逐渐升高,-50 ℃冲击吸收能量从560 ℃开始明显提高。采用840 ~ 920 ℃正火+840 ~ 920 ℃淬火+510 ~ 610 ℃回火处理工艺可使Cr-Ni-Mo-V钢获得较好的综合力学性能。 |
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其他语种文摘
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Effect of heat treatment temperatures (normalizing temperature,quenching temperature and tempering temperature) on the microstructure and mechanical properties of a Cr-Ni-Mo-V steel was investigated by means of OM,SEM and TEM. The results show that the prior austenite grain size of the tested steel changes little (8-17 μm) when the normalizing and quenching temperatures are in the range of 840-920 ℃,which has little effect on the mechanical properties of the final tempered steel. When the tempering temperature increases in the range of 460-660 ℃,the lath width of α-Fe increases from 50 nm at 460 ℃ to 500 nm at 610 ℃,and the laths become obscure at 660 ℃. Meanwhile,the matrix α-Fe decomposes gradually and precipitates out relatively bulky strip-like carbides,which makes the strength of Cr- Ni-Mo-V steel to reduce gradually. When tempered in the range of 510-560 ℃,however,the strength of the steel increases slightly due to secondary hardening caused by precipitation of fine dispersive acicular carbides (50-500 nm) and spherical carbides (< 50 nm). In addition,the elongation increases,and the impact absorbed energy at -50 ℃ improves obviously since 560 ℃. Therefore,the tested Cr-Ni- Mo-V steel can obtain preferred comprehensive mechanical properties by adopting a heat treatment process of 840-920 ℃ normalizing+840- 920 ℃ quenching+510-610 ℃ tempering. |
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来源
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金属热处理
,2018,43(3):177-184 【核心库】
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DOI
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10.13251/j.issn.0254-6051.2018.03.037
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关键词
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Cr-Ni-Mo-V钢
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热处理温度
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原奥氏体晶粒尺寸
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碳化物
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力学性能
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地址
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1.
中国科学院金属研究所, 中国科学院核用材料与安全评价重点实验室, 辽宁, 沈阳, 110016
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中国科学技术大学材料科学与工程学院, 辽宁, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0254-6051 |
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学科
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金属学与金属工艺 |
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基金
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国家重点研发计划
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文献收藏号
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CSCD:6220252
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