中国激光, 2020, 47 (4): 0402004, 网络出版: 2020-04-08   

激光熔覆含氮奥氏体不锈钢层的组织与性能 下载: 974次

Microstructure and Properties of Nitrogenous Austenitic Stainless Steel Prepared Using Laser Cladding
作者单位
南华大学机械工程学院, 湖南 衡阳 421001
摘要
为了获得综合性能优良的含氮奥氏体不锈钢激光熔覆层,以经过超高纯氮气处理的固溶渗氮AISI304粉末为原料,采用激光熔覆技术制备了不同氮含量的奥氏体不锈钢熔覆层,并对熔覆层的组织和性能进行了研究。研究结果表明:在激光熔覆过程中存在氮的析出,熔覆层中存在气孔;随着粉末中的氮含量增加,熔覆层中的氮含量逐渐增加,孔隙率先增大后减小,强度明显提高,但断后伸长率逐渐下降。对于采用氮质量分数为0.41%的粉末制备的熔覆层,其氮的质量分数为0.25%,抗拉强度为(856±20) MPa,屈服强度为(747±15) MPa,断后伸长率为(22±3)%,平均显微硬度为280.68 HV0.2;对于采用氮质量分数为0.16%的粉末制备的熔覆层,其自腐蚀电位为0.0777 V,腐蚀速率为1.6198×10 -5 g/(m 2·h),均远优于AISI304熔覆层。
Abstract
In this study, AISI304 powder processed with solution-nitriding in super pure nitrogen flow as raw material was used to prepare austenite stainless steels cladding layer with different nitrogen contents to obtain the laser cladding layer of nitrogenous austenitic stainless steel with excellent comprehensive performance. Results show that nitrogen precipitates during laser cladding process and pores appear in the cladding layer. As the nitrogen content in powder increases, the nitrogen content in the cladding layer gradually increases,the porosity first increases and then decreases and the strengths significantly enhances, while the elongation gradually decreases. For the cladding layer prepared with power with nitrogen mass fraction of 0.41%, its nitrogen mass fraction is 0.25%, tensile strength is (856±20) MPa, yield strength is (747±15) MPa, elongation is (22±3)% and microhardness is 280.68 HV0.2. For the cladding layer prepared with power with nitrogen mass fraction of 0.16%, its corrosion potential and corrosion rate are 0.0777 V and 1.6198×10 -5 g/(m 2·h) respectively, which are higher than that of the AISI304 cladding layer.

宋勇, 朱伟, 李胜, 张聪, 邱长军. 激光熔覆含氮奥氏体不锈钢层的组织与性能[J]. 中国激光, 2020, 47(4): 0402004. Song Yong, Zhu Wei, Li Sheng, Zhang Cong, Qiu Changjun. Microstructure and Properties of Nitrogenous Austenitic Stainless Steel Prepared Using Laser Cladding[J]. Chinese Journal of Lasers, 2020, 47(4): 0402004.

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