曹文峰,贺瑞军,王晓颖,等.氮氢比对UNIMAX钢离子渗氮组织及性能的影响[J].精密成形工程,2023,15(1):113-119.
CAO Wen-feng,HE Rui-jun,WANG Xiao-ying,et al.Effect of Ratio of Hydrogen to Nitrogen on Microstructure and Properties of UNIMAX Steel with Ion Nitriding[J].Journal of Netshape Forming Engineering,2023,15(1):113-119. |
| 氮氢比对UNIMAX钢离子渗氮组织及性能的影响 |
| Effect of Ratio of Hydrogen to Nitrogen on Microstructure and Properties of UNIMAX Steel with Ion Nitriding |
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| DOI：10.3969/j.issn.1674-6457.2023.01.015 |
| 中文关键词: UNIMAX钢 离子渗氮 表面硬度 渗层深度 渗层组织性能 |
| 英文关键词: UNIMAX steel ion nitriding surface hardness nitrided layer depth microstructure and properties of nitrided layer |
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| 中文摘要: |
| 目的 针对目前我国航空航天、汽车等领域高端制件精密锻造用模具钢离子渗氮表面改进过程的技术瓶颈，通过开展不同氮氢比条件下的工艺试验，揭示离子渗氮过程中不同的氮氢比对UNIMAX钢离子渗氮组织及性能的影响规律。方法 在真空离子氮化炉中，对UNIMAX钢进行温度为500 ℃、压力为250 Pa、不同氮氢比气氛条件下的离子渗氮试验。并采用显微硬度计、显微维氏硬度计、金相显微镜、X射线衍射仪、X射线光电子能谱仪、X射线应力分析仪对上述不同离子渗氮处理后的渗氮层表面硬度、渗层深度、渗层组织、渗层物相组成、表面残余应力、表面脆性进行表征与分析。结果 随着渗氮气氛中N2浓度的降低，渗层深度逐渐减小，扩散层中氮化物组织均匀性逐渐增大，渗层组织中脆性相ε−Fe2,3N相对含量下降，韧性相γ’−Fe4N相对含量提高。表面硬度明显提高，当V(N2)∶V(H2)=1∶1时，最大值可达1 153HV0.2。结论 当V(N2)∶V(H2)=1∶3时，渗层表面硬度与韧性展现出较好的匹配度，在该工艺下可以获得最佳的渗层组织。 |
| 英文摘要: |
| The work aims to conduct process test of different ratio of hydrogen to nitrogen to reveal the effect law of different ratio of hydrogen to nitrogen on the microstructure and properties of UNIMAX steel, so as to solve the technical bottlenecks in ion nitriding surface modification of die steel for precision forging of high-end parts in aerospace, automobile and other fields.Ion nitriding of UNIMAX steel was conducted at different atmosphere under 500 ℃, 250 Pa in vacuum ion nitriding furnace. Microhardness tester, Vickers microhardness tester, optical microscope, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and X-ray stress analyzer were used to analyze and study the surface hardness, depth, microstructure, phase composition, surface residual stress and surface brittleness of nitrided layer after ion nitriding treatment. The results showed that with the decrease of N2 concentration in nitriding atmosphere, the depth of nitrided layer decreased. When the N2 concentration in the nitriding atmosphere decreased, the nitride structure in the diffusion layer became more uniform. At the same time, ε-Fe2,3N content decreased and γ’-Fe4N content increased with the decrease of N2 content in the nitriding atmosphere. After ion nitriding treatment, the surface hardness was improved and it can reach 1 153 HV0.2 when V(N2)∶V(H2)=1∶1. When V(N2)∶ V(H2)=1∶3, the surface hardness and toughness of the nitrided layer show a high degree of matching, and the optimal nitrided layer performance can be obtained with this process. |
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