| 引用本文: | 尤凯,刘小萍,陈凯,王文波,贺志勇.温度对40Cr13钢等离子表面渗铌层组织的影响[J].材料科学与工艺,2015,23(2):68-74.DOI:10.11951/j.issn.1005-0299.20150212. |
| YOU Kai,LIU Xiaoping,CHEN Kai,WANG Wenbo,HE Zhiyong.Microstructure of plasma Nb-alloyed layer on 40Cr13 stainless steel[J].Materials Science and Technology,2015,23(2):68-74.DOI:10.11951/j.issn.1005-0299.20150212. |
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| 摘要: |
| 为提高马氏体不锈钢的耐蚀和耐磨性能,选择40Cr13不锈钢为基材、纯铌板为靶材,采用双辉等离子表面冶金技术在不锈钢表面制备合金化层.用SEM、GDOES、XRD等方法分析渗铌温度对铌合金层组织、成分、相组成、表面形貌及硬度的影响,并对渗层形成机制及表面硬化机理进行了研究.结果表明:在900~1 000 ℃形成的铌合金层组织均匀致密,合金层主要由Nb2C、NbC、Fe2Nb、Cr2Nb及铌组成；合金层表面粗糙度随渗铌温度的提高而增加；合金层厚度随渗铌温度改变发生不同变化规律,950 ℃渗铌形成的渗层约13 μm,900和1 000 ℃渗铌后合金层厚度均为7 μm左右；不同温度渗铌后试样的表面硬度与基体相比均有较大幅度的提高,1 000 ℃渗铌后试样表面硬度高达约985 HV0.025,900 ℃渗铌后约758 HV0.025,而950 ℃渗铌后表面硬度最低,约698 HV0.025. |
| 关键词: 等离子表面合金化 马氏体不锈钢 渗铌层 显微组织 碳化物 硬度 |
| DOI：10.11951/j.issn.1005-0299.20150212 |
| 分类号:TG142.71; TG146.4 |
| 基金项目:国家自然科学基金资助项目(51474154)；山西省自然科学基金资助项目(2012011021-4,0-3). |
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| Microstructure of plasma Nb-alloyed layer on 40Cr13 stainless steel |
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YOU Kai, LIU Xiaoping, CHEN Kai, WANG Wenbo, HE Zhiyong
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(Research Institute of Surface Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
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| Abstract: |
| To improve the corrosion and wear resistances of martensitic stainless steel, an alloying layer was prepared on 40Cr13 stainless steel by double-glow plasma surface alloying technology. Effects of temperature on microstructure, chemical composition, phase structure, surface morphology and hardness of the Nb-alloyed layer are studied using SEM, GDOES, XRD. The formation mechanism of Nb-alloyed layer and its surface hardening mechanism were analyzed. The results show that the Nb-alloyed layers formed at 900~1 000 ℃ are continuous and compact, and mainly consistof Nb2C, NbC, Fe2Nb, Cr2Nb and niobium. The alloyed steel exhibits a rough surface and different thickness of Nb-alloyed layer as alloying temperature increases. The alloyed layer, approximate 13 μm in depth, is formed at 950 ℃ , and at temperature of 900 ℃and 1 000 ℃, the thickness of the alloyed layer is about 7 μm. The surface hardness of the Nb-alloyed steel produced at 0,0 and 1000 ℃ is about 758 HV0.025, 698 HV0.025 and 985 HV0.025,respectively, which greatly increase compared with the untreated 40Cr13 substrate. |
| Key words: plasma surface alloying martensitic stainless steel Nb-alloyed layer microstructure carbide hardness |
