离子渗氮后的扩散处理对<strong>7Cr7Mo2V2Si</strong>冷作模具钢性能的影响

doi:10.11901/1005.3093.2024.263

材料研究学报

2025, Vol. 39

Issue (3): 225-232 DOI: 10.11901/1005.3093.2024.263

研究论文

本期目录 | 过刊浏览

离子渗氮后的扩散处理对7Cr7Mo2V2Si冷作模具钢性能的影响

于兴福¹(

), 西克宇¹, 张宏伟², 王全振³, 郝天赐¹, 郑冬月¹, 苏勇⁴

^1.沈阳工业大学机械工程学院沈阳 110870
^2.民航东北地区空中交通管理局气象中心沈阳 110169
^3.沈鼓集团股份有限公司沈阳 110869
^4.沈阳化工大学机械与动力工程学院沈阳 110142

Effect of Post-diffusion Treatment on Microstructure and Properties of Plasma Nitriding 7Cr7Mo2V2Si Cold Work Mold Steel

YU Xingfu¹(

), XI Keyu¹, ZHANG Hongwei², WANG Quanzhen³, HAO Tianci¹, ZHENG Dongyue¹, SU Yong⁴

^1.School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Northeast Air Traffic Administration Meteorological Center of Civil Aviation, Shenyang 110169, China
^3.Shengu Group Co. Ltd., Shenyang 110869, China
^4.School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

引用本文:

于兴福, 西克宇, 张宏伟, 王全振, 郝天赐, 郑冬月, 苏勇. 离子渗氮后的扩散处理对7Cr7Mo2V2Si冷作模具钢性能的影响[J]. 材料研究学报, 2025, 39(3): 225-232.
Xingfu YU, Keyu XI, Hongwei ZHANG, Quanzhen WANG, Tianci HAO, Dongyue ZHENG, Yong SU. Effect of Post-diffusion Treatment on Microstructure and Properties of Plasma Nitriding 7Cr7Mo2V2Si Cold Work Mold Steel[J]. Chinese Journal of Materials Research, 2025, 39(3): 225-232.

全文: PDF(2907 KB) HTML

摘要:

对7Cr7Mo2V2Si钢表面进行离子渗氮，研究了渗氮后的扩散处理对其微观组织、硬度和摩擦磨损性能的影响。结果表明，在520 ℃对7Cr7Mo2V2Si钢表面渗氮后，渗层的深度约为186 μm，沿渗氮表层的晶界析出了较多的脉状组织。在550 ℃扩散处理使7Cr7Mo2V2Si钢渗氮层的脉状组织减少、渗氮层的深度增加。扩散处理10、20和30 h，渗氮层的深度分别提高了15.59%、24.73%和36.02%。高温扩散处理后，在钢中产生了回火马氏体组织。回火马氏体组织能阻止晶粒的滑移和塑性变形，使钢的强度和韧性提高。未渗氮试样的平均硬度为674.8HV，离子渗氮处理后试样的最高硬度为1276.4HV。离子渗氮使7Cr7Mo2V2Si钢的耐磨性能显著提高。未渗氮的试样其磨损表面产生了较多犁沟和剥落坑，离子渗氮使磨损程度降低、犁沟变浅和剥落坑减少。与未渗氮的7Cr7Mo2V2Si钢相比，在520 ℃离子渗氮使磨损量降低了59.48%，摩擦系数降低了26.63%。在520 ℃离子渗氮后再进行不同时间的扩散处理，使7Cr7Mo2V2Si钢的硬度和耐磨性降低但是表面硬度仍比未渗氮的高。与只渗氮的试样相比，扩散处理30 h后表面最高硬度由1276.4HV降低到881.5HV，平均摩擦系数从0.4731提高到0.5939，磨损量从4.7 mg增加到9.3 mg。

关键词 ：金属材料, 7Cr7Mo2V2Si钢, 离子渗氮, 扩散处理, 硬度, 摩擦磨损

Abstract：

Surface modification treatment of 7Cr7Mo2V2Si steel was conducted by using plasma nitriding, and the effect of post diffusion treatment on its microstructure, hardness, and friction and wear properties was investigated. The results showed that the nitriding layer on 7Cr7Mo2V2Si steel generated by plasma nitriding at 520 ^oC of about 186 μm in thickness, presented a microstructure with abundant vein-like network along grain boundaries. After diffusion treatment at 550 ^oC, the microstructure of vein-like network in the nitriding layer was gradually shrinked or disappeared, while the thickness of nitriding layer increased. The thickness of the nitriding layer was increased by 15.59%, 24.73% and 36.02% respectively, corresponding to the post diffusion time for 10 h, 20 h and 30 h. After post-diffusion treatment, tempered martensite was formed in the steel, which prevents significantly grain slip and plastic deformation, and improves the strength and toughness of the steel. The average hardness of the bare steel was 674.8HV, while the highest hardness of 1276.4HV was for the nitriding layer. Plasma nitriding can significantly improve the wear resistance of 7Cr7Mo2V2Si steel. A large number of plowing grooves and spalling pits appeared on the wear surface of the steel without nitriding treatment, while after plasma nitriding treatment, the wear degree is reduced, the plowing grooves became shallower, and the spalling pits also reduced. Compared with the bare 7Cr7Mo2V2Si steel, the wear loss amount was reduced by 59.48% for the steel being plasma nitride at 520 ^oC, and the friction coefficient was reduced by 26.63%. After plasma nitriding and post diffusion treatment for different time, the hardness of 7Cr7Mo2V2Si steel was decreased. Compared to the as nitriding steel, the maximum surface hardness decreased from 1276.4HV to 881.5HV for the steel subjected to plasma nitriding plus post diffusion treatment for 30 h, and the average friction coefficient and the wear loss amount decreased from 0.4731 and 4.7 mg to 0.5939 and 9.3 mg respectively.

Key words： metallic materials 7Cr7Mo2V2Si steel plasma nitriding diffusion treatment hardness friction and wear

收稿日期: 2024-06-12

ZTFLH:

TG156.5

基金资助:辽宁省教育厅项目(JYTMS20231194)

通讯作者: 于兴福，教授，yuxingfu@163.com，研究方向为耐热钢及高温合金

Corresponding author: YU Xingfu, Tel: 13604072060, E-mail: yuxingfu@163.com

作者简介: 于兴福，男，1976年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.263 或 https://www.cjmr.org/CN/Y2025/V39/I3/225

图1 7Cr7Mo2V2Si钢的微观组织

图2 7Cr7Mo2V2Si钢经520 ℃ × 24 h离子渗氮并在550 ℃扩散不同时间后渗氮层的厚度

图3 7Cr7Mo2V2Si钢经520 ℃ × 24 h离子渗氮并扩散不同时间后渗层的组织

图4 7Cr7Mo2V2Si钢经520 ℃ × 24 h离子渗氮并扩散不同时间后的XRD谱

图5 不同状态7Cr7Mo2V2Si钢的硬度梯度

图6 不同状态7Mo2V2Si钢在摩擦磨损测试后表面的形貌

图7 不同状态7Cr7Mo2V2Si钢的摩擦系数曲线和磨损失重

图8 7Cr7Mo2V2Si钢离子渗氮后在550 ℃扩散处理不同时间生成脉状组织和碳化物的演化示意图

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