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Microstructure analysis of novel LPBF-processed duplex stainless steels correlated to their mechanical and corrosion properties

机译：新型LPBF加工双相不锈钢的微观结构分析与其机械和腐蚀性能相关

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摘要

The austenitic steel AISI 316L has recently become one of the most popular alloys for laser powder bed fusion as it shows good mechanical properties along with sufficient corrosion resistance. For duplex stainless steels the LPBF process does not seem to be as attractive as a solution annealing treatment is required to attain the desired austenite and ferrite microstructure. The goal of this study is to identify a chemical composition that shows enhanced corrosion resistance and tensile strength compared to AISI 316L without requiring a post-process heat treatment like the conventional duplex stainless steels. Based on thermodynamic simulations powder mixtures of austenitic stainless steel AISI 316L and duplex stainless steel AISI 318LN in three mixing ratios have been processed. The influence of the chemical composition and LPBF processing parameters on the resulting micro-structure are investigated by light optical microscopy and electron backscatter diffraction. Tensile tests were conducted and polarization curves recorded to evaluate the potential of the most promising alloy. 30 wt.-% of AISI 318LN added to AISI 316L lead to an austenite/ferrite microstructure in the as-built condition. The phase fractions vary with the LPBF processing parameters. The strength as well as corrosion resistance of this new alloy is superior to that of pure AISI 316L, while the ductility is lower.
机译：奥氏体钢AISI 316L最近成为激光粉床融合最受欢迎的合金之一，因为它显示出良好的机械性能以及充分的耐腐蚀性。对于双相不锈钢钢，LPBF工艺似乎并不像溶液退火处理所需的那样有吸引力，以获得所需的奥氏体和铁氧体微观结构。该研究的目的是鉴定与AISI 316L相比，表现出增强的耐腐蚀性和拉伸强度的化学组合物，而不需要像传统的双相不锈钢等后工艺热处理。基于热力学模拟三种混合比中的奥氏体不锈钢AISI 316L和双相不锈钢AISI 318LN的粉末混合物。通过光学显微镜和电子反向散射衍射研究了化学成分和LPBF处理参数对所得到的微结构的影响。进行拉伸试验，并记录偏振曲线以评估最有前途合金的潜力。 30重量％的AISI 318LN加入AISI 316L，导致奥氏体/铁氧体显微组织在原木条件下。相位分数随LPBF处理参数而变化。这种新合金的强度以及耐腐蚀性优于纯AISI 316L的耐腐蚀性，而延展性较低。

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