Chromizing of Additively Manufactured Maraging Steel; Microstructural Evolution and Corrosion Performance

IF 0.3 Q4 THERMODYNAMICS HTM-Journal of Heat Treatment and Materials Pub Date : 2022-08-01 DOI:10.1515/htm-2022-1012
C. V. Funch, K. Dahl, T. Christiansen, M. Somers
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Abstract

Abstract While maraging steels are excellent candidates for additive manufacturing of high-strength materials, most of them provide little to no corrosion resistance. In this study, the surface of additively manufactured maraging steel is augmented with diffusion-based chromizing. The diffusion of chromium into the surface results in the formation of α-Cr, σ-phase and austenite depending on the chromium content at the respective distance from the surface. The bulk consists of a ductile bcc martensite hardened by precipitation of intermetallics during a low temperature ageing treatment. The σ-case provides a very high hardness, while the austenite phase is rather soft and unaffected by the ageing treatment. The chromizing treatment significantly reduced the corrosion rate of the maraging steel up to a factor of 14. Decomposition of the σ-case into a uniform case of austenite (austenitic stainless steel) further improved the corrosion resistance almost 24 times. This showed the strong potential of the chromizing treatment on a highstrength material to obtain a combination of their beneficial properties.
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添加剂制备马氏体时效钢的渗铬微观组织演变与腐蚀性能
虽然马氏体时效钢是高强度材料增材制造的优秀候选者,但它们中的大多数几乎没有抗腐蚀性。在本研究中,采用扩散渗铬法增强了增材马氏体时效钢的表面。铬在表面的扩散导致α-Cr相、σ-相和奥氏体的形成,这取决于铬在离表面不同距离处的含量。在低温时效处理过程中,由金属间化合物析出而硬化的韧性bcc马氏体组成。σ-相具有很高的硬度,而奥氏体相较软,不受时效处理的影响。铬化处理显著降低了马氏体时效钢的腐蚀速率,可达原来的14倍。将σ-体分解为均匀的奥氏体(奥氏体不锈钢),其耐蚀性提高了近24倍。这表明了在高强度材料上进行铬化处理以获得两者有益性能组合的强大潜力。
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CiteScore
1.50
自引率
33.30%
发文量
43
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