Li Bolin, Zhang Shuai, Wang Shenghai, Wang Li, He Yinchuan, Cui Yaning, Liu Dan, Wang Mingxu
School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai 264209, China.
Weihai Institute of Industrial Technology, Shandong University, Weihai 264209, China.
Materials (Basel). 2023 Jul 5;16(13):4827. doi: 10.3390/ma16134827.
Application of the 316 L stainless steel (SS) is limited by its relatively low wear resistance, insufficient strength, and poor corrosion resistance in special environments. To this end, effects of Mo particles addition on the microstructure, mechanical properties, and corrosion resistance of the laser powder bed fusion (LPBF) 316 L SS are investigated in this study. The results show that the addition of Mo particles from 0 wt.% to 10 wt.% can modify the crystal orientation and improve the strength, wear resistance, and corrosion resistance of LPBF 316 L SSs. Particularly, the LPBF 316 L SS forms a biphasic structure with a similar ratio of α-Fe to γ-Fe with 5 wt.% Mo addition. As a result, the corresponding samples possess both the excellent toughness of austenitic SSs and the high strength and corrosion resistance of ferrite SSs, which reaches a high tensile strength of about 830 MPa, together with a low friction coefficient of 0.421 μ. Since the Mo particles addition is beneficial to increase the content of CrO on the samples surface from 13.48% to 22.68%, the corrosion current density of 316 L SS decreases by two orders of magnitude from 569 nA to 6 nA, while the mechanical properties remain favorable. This study is expected to serve as a reference for the preparation of LPBF SSs with excellent integrated performance.
316L不锈钢（SS）的应用受到其相对较低的耐磨性、强度不足以及在特殊环境中较差的耐腐蚀性的限制。为此，本研究考察了添加Mo颗粒对激光粉末床熔融（LPBF）316L SS的微观结构、力学性能和耐腐蚀性的影响。结果表明，添加0 wt.%至10 wt.%的Mo颗粒可以改变晶体取向，并提高LPBF 316L SS的强度、耐磨性和耐腐蚀性。特别是，添加5 wt.% Mo的LPBF 316L SS形成了α-Fe与γ-Fe比例相似的双相结构。结果，相应的样品兼具奥氏体SS优异的韧性以及铁素体SS的高强度和耐腐蚀性，其拉伸强度高达约830 MPa，摩擦系数低至0.421μ。由于添加Mo颗粒有利于将样品表面的CrO含量从13.48%提高到22.68%，316L SS的腐蚀电流密度从569 nA降低两个数量级至6 nA，同时力学性能保持良好。本研究有望为制备具有优异综合性能的LPBF SS提供参考。
