金属热处理 ›› 2020, Vol. 45 ›› Issue (3): 196-199.DOI: 10.13251/j.issn.0254-6051.2020.03.038

• 工艺研究 • 上一篇    下一篇

回火工艺对1Cr12Ni3MoVN钢组织和性能的影响

闫磊, 李许明, 李凯峰, 马凤春   

  1. 中国航发沈阳黎明航空发动机有限责任公司 技术中心, 辽宁 沈阳 110043
  • 收稿日期:2019-09-26 出版日期:2020-03-25 发布日期:2020-04-03
  • 作者简介:闫 磊(1987—),男,工程师,主要研究航空发动机用金属材料应用技术,E-mail:yanlei19871016@163.com。

Effect of tempering process on microstructure and properties of 1Cr12Ni3MoVN steel

Yan Lei, Li Xuming, Li Kaifeng, Ma Fengchun   

  1. Technique Center, AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang Liaoning 110043, China
  • Received:2019-09-26 Online:2020-03-25 Published:2020-04-03

摘要:

通过显微组织分析、室温拉伸试验、冲击试验、硬度试验,研究不同回火制度下1Cr12Ni3MoVN钢的显微组织与力学性能。结果表明,随着回火温度的增加,1Cr12Ni3MoVN钢析出相数量不断增加,对材料的强度、冲击性能具有增强效果;碳化物聚集长大,基体组织逐渐由马氏体向回火索氏体转变,杂质元素在晶界处偏聚而降低了材料的断裂抗性,冲击韧性降低,回火温度应取较低温度;随565 ℃回火时间的延长,1Cr12Ni3MoVN钢抗拉强度、屈服强度、硬度下降,塑性变化不大,冲击吸收能量略有增加,回火保温时间不宜过长;随回火冷却速度的降低,1Cr12Ni3MoVN钢强度先升后降,塑性变化不大,冲击吸收能量显著下降,硬度变化不大,建议以空冷方式进行回火冷却。最佳的回火热处理工艺为565 ℃保温2 h,空冷。

关键词: 1Cr12Ni3MoVN钢, 回火工艺, 组织与性能

Abstract:

Microstructure and mechanical properties of 1Cr12Ni3MoVN steel were studied by means of microstructure analysis, tensile test at room temperature, impact test and hardness test. The results show that with the increase of tempering temperature, the precipitates of 1Cr12Ni3MoVN steel increase, which has a strengthening effect on strength and impact properties of the material. As the carbides aggregate and grow up, the microstructure of matrix tends to change from martensite to tempered sorbite; the segregation of impurity elements at the grain boundary reduces the fracture resistance of the material, the impact toughness decreases, and therefore the tempering temperature should be lower. With the extension of the tempering time at 565 ℃, the tensile strength, yield strength and hardness of 1Cr12Ni3MoVN steel decrease, the plasticity changes little, the impact absorbed energy increases slightly, so the tempering holding time should not be too long. With the decrease of tempering cooling speed, the strength of 1Cr12Ni3MoVN steel increases first and then decreases, the plasticity changes little, the impact absorbed energy decreases significantly, and the hardness changes little, so it is recommended to use air cooling for tempering cooling. The optimal heat treatment process of tempering is 565 ℃ for 2 h, air cooling.

Key words: 1Cr12Ni3MoVN steel, tempering process, microstructure and properties

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