Effect of powder morphology on mechanical properties of selective laser melting 316L stainless steel

doi:10.13251/j.issn.0254-6051.2021.02.031

Abstract

Abstract: 316L stainless steel bulk was prepared with aerosolized powders by plasma spheroidization (PS) and selective laser melting (SLM) technologies. The microstructure and mechanical properties of the PS powder and the 316L stainless steel bulk were characterized by XRD, SEM, laser scattering, tap-density tester and universal mechanical testing machine. The results show that the PS powder has more spherical particles and less irregular flat ones than that of the aerosolized powder, and its HR value (the ratio of vibrational density to loose density) reduces from 1.28 to 1.08, which indicating that the fluidity has been improved significantly. The phase composition in the SLM bulk is the same as that of raw material powder, which are typical austenitic stainless steel structure(γ-Fe+α-Fe). Compared with that of the 316L stainless steel bulk prepared by aerosolized powder, the mechanical properties and compactness of the PS bulk have a certain degree of improvement, which mainly due to the higher density of the precursor powder prepared by PS and its increased sphericity and better fluidity.

Key words: 316L stainless steel, plasma spheroidization, selective laser melting, microstructure, mechanical properties

CLC Number:

TG142

Zhang Yamin, Wu Yaosha, Yang Junbao, Liu Xiaoqing. Effect of powder morphology on mechanical properties of selective laser melting 316L stainless steel[J]. Heat Treatment of Metals, 2021, 46(2): 173-177.

References

[1] Li X P,Van Humbeeck J,Kruth J P.Selective laser melting of weak-textured commercially pure titanium with high strength and ductility:A study from laser power perspective[J].Materials &Design,2017,116:352-358.
[2] Wei K,Wang Z,Zeng X.Preliminary investigation on selective laser melting of Ti-5Al-2.5Sn α-Ti alloy:From single tracks to bulk 3D components[J].Journal of Materials Processing Technology,2017,244:73-85.
[3] 李浩浩,武美萍,马毅青,等.再扫描对选区激光熔化成形TC4钛合金组织与性能的影响[J].金属热处理,2020,45(8):91-96.
Li Haohao,Wu Meiping,Ma Yiqing,et al.Effect of rescanning on microstructure and properties of TC4 titanium alloy prepared by selective laser melting[J].Heat Treatment of Metals,2020,45(8):91-96.
[4] 马聪慧,王长军,沈韬,等.选区激光熔化法制备的M2052锰铜合金的组织与性能[J].金属热处理,2020,45(8):97-104.
Ma Conghui,Wang Changjun,Shen Tao,et al.Microstructure and properties of M2052 Mn-Cu alloy prepared by selective laser melting method[J].Heat Treatment of Metals,2020,45(8):97-104.
[5] 谢燕翔,任垚嘉,刘世锋,等.激光选区熔化成形316L不锈钢冲击缺口敏感性[J].金属热处理,2019,44(11):95-99.
Xie Yanxiang,Ren Yaojia,Liu Shifeng,et al.Notch sensitivity of selective laser melting 316L stainless steel[J].Heat Treatment of Metals,2019,44(11):95-99.
[6] Liu Qi,Song Bo,Liao Hanlin,et al.Microstructure study on selective laser melting yttria stabilized zirconia ceramic with near IR fiber laser[J].Rapid Prototyping Journal,2014,38:346-354.
[7] Yan Mengxue,Tian Xiaoyong,Peng Gang,et al.High temperature rheological behavior and sintering kinetics of CF/PEEK composites during selective laser sintering[J].Composites Science and Technology,2018,165:140-147.
[8] Yan Mengxue,Tian Xiaoyong,Peng Gang,et al.Hierarchically porous materials prepared by selective laser sintering[J].Materials &Design,2017,135:62-68.
[9] Li Ruidi,Liu Jinhui,Shi Yusheng,et al.316L stainless steel with gradient porosity fabricated by selective laser melting[J].Journal of Materials Engineering and Performance,2010,19(5):666-671.
[10] Huang Mingji,Zhang Zongxin,Chen Ping.Effect of selective laser melting process parameters on microstructure and mechanical properties of 316L stainless steel helical micro-diameter spring[J].The International Journal of Advanced Manufacturing Technology,2019,104:2117-2131.
[11] Salmana O,Brenneb F,Niendorf T,et al.Impact of the scanning strategy on the mechanical behavior of 316L steel synthesized by selective laser melting[J].Journal of Manufacturing Processes,2019,45:255-261.
[12] Liu Tian,Jeremy D Leazer,Sarath K Menon,et al.Microstructural analysis of gas atomized Al-Cu alloy feedstock powders for cold spray deposition[J].Surface &Coatings Technology,2018,350:621-632.
[13] Kenny L Alvarez,Martín J M,Burgos N,et al.Structural and magnetic properties of amorphous and nanocrystalline Fe-Si-B-P-Nb-Cu alloys produced by gas atomization[J].Journal of Alloys and Compounds,2019,810:151754.
[14] Sun Shijie,Zhuang Ma,Liu Yanbo,et al.Preparation and characterization of ZrB₂/SiC composite powders by induction plasma spheroidization technology[J].Ceramics International,2019,45(1):1258-1264.
[15] Hao Zhenhua,Fu Zhenhua,Liu Jintao,et al.Spheroidization of a granulated molybdenum powder by radio frequency inductively coupled plasma[J].International Journal of Refractory Metals and Hard Materials,2019,82:15-22.
[16] Zou Y M,Wu Y S,Wang J Z,et al.Preparation,mechanical properties and cyclic oxidation behavior of the nanostructured NiCrCoAlY-TiB₂ coating[J].Ceramics International,2018,44:19362-19369.
[17] 王记中,车晓舟,吴姚莎,等.热喷涂用纳米NiCrCoAlY-TiB₂结构喂料的制备及其性能研究[J].材料研究学报,2017,31(6):465-471.
Wang Jizhong,Che Xiaozhou,Wu Yaosha,et al.Properties of nano-composite powders of NiCrCoAlY-TiB₂ prepared by high energy ball milling for high velocity air fuel spraying[J].Chinese Journal of Materials Research,2017,31(6):465-471.