氮碳氧复合处理(QPQ)对MPS700A钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2021.04.014

金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 83-87.DOI: 10.13251/j.issn.0254-6051.2021.04.014

氮碳氧复合处理(QPQ)对MPS700A钢组织与性能的影响

潘虹吉¹, 罗德福¹, 陈甥怡²

1.西华大学材料科学与工程学院, 四川成都 610039;
2.湖南红宇智能制造有限公司, 湖南长沙 410000

收稿日期:2020-11-26 出版日期:2021-04-25 发布日期:2021-05-08
通讯作者: 罗德福,教授,E-mail:cd_df@126.com
作者简介:潘虹吉(1996—),男,硕士研究生,主要研究方向为金属材料表面改性,E-mail:hongjipan123@163.com。

Effect of nitride carbonize and oxidize multi-treatment (QPQ) on microstructure and properties of MPS700A steel

Pan Hongji¹, Luo Defu¹, Chen Shengyi²

1. College of Materials Science and Engineering, Xihua University, Chengdu Sichuan 610039, China;
2. Hunan Hongyu Intelligent Manufacturing Co., Ltd., Changsha Hunan 410000, China

Received:2020-11-26 Online:2021-04-25 Published:2021-05-08

摘要/Abstract

摘要： 采用氮碳氧复合处理(QPQ)技术对耐蚀耐热不锈钢MPS700A钢进行表面改性,分别进行(450～500) ℃×5 h和(550～570) ℃×3 h盐浴氮碳共渗试验,氧化处理工艺均为400 ℃×30 min。对QPQ处理后试样渗层的表面形貌、表面硬度、脆性及其耐磨性进行了分析。结果表明:渗层主要由氧化膜层、疏松层、化合物层和扩散层构成,QPQ处理后试样的硬度明显提高,相对低温段490 ℃盐浴氮碳共渗试样的硬度最高,相对高温段550 ℃处理的试样硬度最高,分别为1295、1344 HV0.1,分别是基体硬度的3.75和3.90倍。QPQ处理试样的渗层组织细小,均匀致密,脆性低,耐磨性好,比祼钢具有较好的高温摩擦磨损性能,尤其在500 ℃以上性能更加优异。且与550 ℃盐浴氮碳共渗QPQ试样相比,490 ℃盐浴氮碳共渗QPQ试样具有更低的脆性,更好的高温摩擦磨损性能。

关键词: 氮碳氧复合处理(QPQ), 表面形貌, 表面硬度, 脆性, 耐磨性

Abstract: Corrosion resistant and heat resistant stainless steel MPS700A steel was surface modified by nitride carbonize and oxidize multi-treatment(QPQ) technology, and then the salt bath nitrocarburizing tests were conducted at 450-500 ℃ for 5 h and 550-570 ℃ for 3 h respectively, both with the oxidation treatment process at 400 ℃ for 30 min. Then the surface morphologies, surface hardness, brittleness and wear resistance of the QPQ treated specimens were analyzed. The results show that the QPQ treated layer is mainly composed of oxide film, loose layer, compound layer and diffusion layer, and the hardness of the QPQ specimens is obviously improved. The hardness values of the specimens nitrocarburized respectively at 490 ℃ and 550 ℃ are the highest in the low and the high temperature ranges, respectively being 1295 HV0.1 and 1344 HV0.1, i.e., 3.75 and 3.90 times of that of the matrix steel. The QPQ treated layers have fine, uniform and compact microstructures, and have low brittleness, good wear resistance, and better high temperature friction and wear performance than that of the bare steel, especially above 500 ℃. Compared with that at 550 ℃, the QPQ specimen nitrocarburized at 490 ℃ in salt bath has lower brittleness and better high temperature friction and wear performance.

Key words: nitride carbonize and oxidize multi-treatment (QPQ), surface morphology, surface hardness, brittleness, wear resistance

中图分类号:

TG156.8⁺2

潘虹吉, 罗德福, 陈甥怡. 氮碳氧复合处理(QPQ)对MPS700A钢组织与性能的影响[J]. 金属热处理, 2021, 46(4): 83-87.

Pan Hongji, Luo Defu, Chen Shengyi. Effect of nitride carbonize and oxidize multi-treatment (QPQ) on microstructure and properties of MPS700A steel[J]. Heat Treatment of Metals, 2021, 46(4): 83-87.

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氮碳氧复合处理(QPQ)对MPS700A钢组织与性能的影响

Effect of nitride carbonize and oxidize multi-treatment (QPQ) on microstructure and properties of MPS700A steel

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