Alternative TitleEffect of heat treatment temperature on microstructure and mechanical properties of Cr-Ni-Mo-V steel
张守清; 胡小锋; 姜海昌; 闫德胜; 戎利建
Source Publication金属热处理
Abstract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(8~17μm),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。
Other AbstractEffect 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 of840-920 ℃,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 CrNi-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-NiMo-V steel can obtain preferred comprehensive mechanical properties by adopting a heat treatment process of 840-920 ℃ normalizing+840-920 ℃ quenching+510-610 ℃ tempering.
KeywordCr-Ni-Mo-V钢 热处理温度 原奥氏体晶粒尺寸 碳化物 力学性能
Indexed ByCSCD
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Cited Times:3[CSCD]   [CSCD Record]
Document Type期刊论文
Recommended Citation
GB/T 7714
张守清,胡小锋,姜海昌,等. 热处理温度对Cr-Ni-Mo-V钢组织和力学性能的影响[J]. 金属热处理,2018,43.0(003):177-184.
APA 张守清,胡小锋,姜海昌,闫德胜,&戎利建.(2018).热处理温度对Cr-Ni-Mo-V钢组织和力学性能的影响.金属热处理,43.0(003),177-184.
MLA 张守清,et al."热处理温度对Cr-Ni-Mo-V钢组织和力学性能的影响".金属热处理 43.0.003(2018):177-184.
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