Microstructure and Mechanical Properties of the Large Thickness High Nitrogen Austenitic Stainless Steel Component Deposited by Multi-layer and Multi-pass Plasma Arc Additive Manufacturing Process
SUN Yue1,2, FENG Yuehai1,2, LIU Siyu1, WANG Kehong1,2
1 School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China 2 MIIT Key Laboratory of Intelligent Controlled-arc Additive Manufacturing, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract: High nitrogen austenitic stainless steel (HNS) components of 25 mm thick were deposited successfully by wire and plasma arc additive manufacturing process, in which the self-developed HNS wire is selected as the filling material. Then weld defects, chemical composition, microstructures and mechanical properties of HNS components were tested and analyzed by X-ray detection, SEM, EDS and mechanical testing machine. Moreover, the influences of deposited speed on microstructure and mechanical properties were investigated in details, then the microstructure evolution and enhancement mechanism of multi-layer and multi-pass additive manufacturing process were revealed. Experiment results show that only few tiny pores are found in the deposited samples,and all the alloy elements is evenly distributed in deposited components. The microstructure of the effective deposited layers is composed of large amount of austenite, few d-ferrite and some nitrides. Meanwhile, lots of ferrite bands are also found at the interfaces of both adjacent deposited layers and adjacent deposited beads. Furthermore, with the deposited speed reducing from 30 cm/min to 18 cm/min, the width of the ferrite band between the upper and lower layers decreases from 160 μm to 35 μm, and the heat input of each deposited layer decreases from 1.275×104 kJ to 1.042×104 kJ. In addition, the ultimate tensile strength of the deposited samples in horizontal direction and that in vertical direction individually increased by 90 MPa and 76 MPa on an average, the mean elongation in both horizontal direction and vertical direction individually improved by 6.5% and 7.0%, and the average impact toughness in two directions individually enhanced by 12.07 J/cm2 and 4.02 J/cm2. Hardness testing results exhibited the microhardness of the HNS samples raised by 22.2 HV on an average.
孙跃, 冯曰海, 刘思余, 王克鸿. 大厚度高氮钢多层多道等离子弧增材构件的组织与性能分析[J]. 材料导报, 2020, 34(22): 22118-22123.
SUN Yue, FENG Yuehai, LIU Siyu, WANG Kehong. Microstructure and Mechanical Properties of the Large Thickness High Nitrogen Austenitic Stainless Steel Component Deposited by Multi-layer and Multi-pass Plasma Arc Additive Manufacturing Process. Materials Reports, 2020, 34(22): 22118-22123.
Talha M, Behera C K, Sinha O P. Materials Science and Engineering C, 2013, 33(7), 3563.2 Miyano Y, Fujii H, Sun Y, et al. Materials Science and Engineering A, 2011, 528(6), 2917.3 Xin X C, Zhang J J, Huang G Z, et al. Applied Laser, 2017, 37(5), 668 (in Chinese).辛秀成, 张今捷, 黄根哲, 等.应用激光, 2017, 37(5), 668.4 Li D J, Lu S P, Li D Z, et al. Acta Metallurgica Sinica, 2013, 49(2), 129(in Chinese).李冬杰, 陆善平, 李殿中, 等.金属学报, 2013, 49(2), 129.5 Horgar A, Fostervoll H, Nyhus B, et al. Journal of Materials Processing Technology, 2018, 259, 68.6 Lin J J, Lv Y H, Liu Y X, et al. Materials and Design, 2016, 102, 30.7 Martina F, Mehnen J, Williams S W, et al. Journal of Materials Proces-sing Technology, 2012, 212(6), 1377.8 Kobayashi Y, Sagara M, Kobayashi Y, et al. Materials and Manufactu-ring Processes, 2004, 19(1), 19.9 Mohammed R, Reddy G M, Rao K S. Defence Technology, 2017, 13(2), 59.10 Wen Z L, Zhou Q, Yu J. Hot Working Technology, 2017, 46(23), 235(in Chinese).闻章鲁, 周琦, 余进.热加工工艺, 2017, 46(23), 235.11 Pai A, Sogalad I, Albert S K, et al. Procedia MaterialsScience, 2014, 5(2-3), 1482.12 Liu H D, Wang D Z, Wei H D, et al. Special Steel, 2009, 30(4), 45(in Chinese).刘海定, 王东哲, 魏捍东, 等. 特殊钢, 2009, 30(4), 45.
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2020, Vol. 34 
