| 渗氮温度对40Cr钢QPQ组织与性能的影响 |
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| 引用本文： | 唐彩,陈波.渗氮温度对40Cr钢QPQ组织与性能的影响[J].金属热处理,2020,45(3):174-177. |
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| 作者姓名： | 唐彩 陈波 |
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| 作者单位： | 1. 江苏徐工工程机械研究院有限公司, 江苏 徐州 221004;
2. 徐工集团高端工程机械智能制造国家重点实验室, 江苏 徐州 221004 |
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| 摘 要： | 采用光学显微镜(OM)对不同渗氮温度QPQ处理的40Cr钢表面渗氮层显微组织进行观察分析,同时进行维氏硬度试验与销盘摩擦磨损试验,获得渗氮层硬度梯度与磨损失重,并观察分析了磨损表面SEM形貌。结果表明,经不同渗氮温度的QPQ处理后,40Cr钢表面均形成了由氧化膜层、化合物层与扩散层构成的表面渗氮层。但随渗氮温度的升高,其渗氮层厚度呈先增加后减小的变化趋势,4种渗氮温度(580、600、620、640 ℃)下样品有效渗层深度分别为0.14、0.20、0.29、0.26 mm。随渗氮温度的升高,磨损量呈先减小后增大的趋势,在620 ℃下达到最低值。4种渗氮温度下磨损形式均以磨粒磨损与粘着磨损为主,但随着渗氮温度升高带来渗氮层厚度与硬度的变化,磨损程度呈现逐渐减轻的趋势。
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| 关 键 词： | 渗氮温度 QPQ处理 显微组织 显微硬度 耐磨性 |
| 收稿时间： | 2019-09-26 |
Effect of nitriding temperature on microstructure and properties of QPQ treated 40Cr alloy steel |
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| Tang Cai,Chen Bo.Effect of nitriding temperature on microstructure and properties of QPQ treated 40Cr alloy steel[J].Heat Treatment of Metals,2020,45(3):174-177. |
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| Authors: | Tang Cai Chen Bo |
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| Affiliation: | 1. Jiangsu XCMG Construction Machinery Research Institute Ltd., Xuzhou Jiangsu 221004, China;
2. State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery, Xuzhou Jiangsu 221004, China |
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| Abstract: | Microstructure of QPQ treated 40 Cr alloy steel under different nitriding temperature was observed and analyzed by means of optical microscopy(OM),Vickers hardness test and pin-disc friction and wear test,the hardness gradient and wear weight loss of the carburized layer were carried out,and the morphologies of the worn surface was observed and analyzedby using SEM.The results show that after QPQ treatment at different nitriding temperatures,a surface layer consisting of oxide film,compound layer and diffusion layer is formed on the surface of 40 Cr steel.However,with the increase of nitriding temperature,the thickness of nitriding layer increases first and then decreases,and the effective depth of nitriding layer reaches 0.14,0.20,0.29 and 0.26 mm when thenitriding temperatures are 580,600,620 and 640℃,respectively.With the increased of nitriding temperature,the wear loss decreases first and then increases,which reaches the lowest value at620℃.The wear forms are all mainly abrasive wear and adhesive wear under those four nitriding temperatures,but with the increase of nitriding temperature which changes the thickness and hardness of the nitrided layer,the wear degree shows a gradual decreasing trend. |
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| Keywords: | nitriding temperature QPQ process microstructure microhardness wear resistance |
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