Thermochemical post-processing of additively manufactured austenitic stainless steel

扫码查看

原文链接

NSTL

外文摘要：© 2022 The AuthorsThe effects of different thermochemical post-processing treatments on the microstructure and properties of additively manufactured austenitic stainless steel were investigated. If the nitrogen content in the as-built condition is high, austenitization in vacuum causes a reduction in nitrogen content near the surface. This can be remedied by applying a small amount of nitrogen in the gas during austenitization. Using high temperature solution nitriding, the surface hardness could be effectively raised by deliberate nitrogen ingress, while maintaining a very fine structure inside the primary austenite grains. The excellent combination of strength and ductility of the as-built condition is accompanied by a low degree of work-hardening. This condition showed elastic and plastic anisotropy. The vertically built condition exhibits a lower strength and an early initiation of yielding as compared to the horizontally built conditions. High temperature treatments were able to efficiently reduce the mechanical anisotropy exhibited in the as-built condition. A combination of high- and low temperature surface hardening was investigated using nitriding, carburizing and nitrocarburizing. In all cases expanded austenite developed on the surface, which created a strong hardness increase.

外文关键词：

Additive manufacturingAustenitic stainless steelHigh temperature solution nitridingLow temperature surface hardeningMechanical anisotropyMicrostructure characterizationThermochemical surface treatment

作者：

Funch C.V.、Somlo K.、Christiansen T.L.、Somers M.A.J.

展开 >

作者单位：

Department of Mechanical Engineering Technical University of Denmark

出版年：

2022

DOI：

10.1016/j.surfcoat.2022.128495

Surface & Coatings Technology

ISTP

ISSN：0257-8972

年,卷(期)：2022.441

参考文献量72