Oxidation Behavior of Heat-Resistant Type HK Steel (HK30Nb) at 800 °C

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Oxidation of Metals Pub Date : 2023-07-17 DOI:10.1007/s11085-023-10168-0

Marie Romedenne, Bruce Pint, Michael Lance, Sebastien Dryepondt

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Abstract

The cyclic oxidation behavior of HK30Nb heat-resistant steel processed by laser powder bed fusion (LPBF) was compared to its cast counterpart during exposures in air and air + 10% H₂O at 800 °C. The specific finer microstructure and lower Mn of the LPBF alloy resulted in lower oxidation rates in dry air and faster establishment of a continuous Cr₂O₃ scale in air + 10% H₂O compared to coarse-grained cast HK30Nb with higher Mn. Differences in alloy mechanical strength and therefore their ability to accommodate high temperature and oxidation-induced stresses as well as differences in thermal expansion coefficients between the alloy and the formed oxides (Cr₂O₃ only for the LPBF and Cr₂O₃ and MnCr₂O₄ for the cast specimens) during temperature cycling were found to result in a greater extent of spallation for the LPBF than for the cast alloy in dry air at 800 °C.

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耐热型HK钢(HK30Nb)在800℃下的氧化行为

研究了激光粉末床熔合(LPBF)热处理的HK30Nb耐热钢与铸造钢在800℃空气和空气+ 10% H2O环境中的循环氧化行为。与粗晶高Mn的铸态HK30Nb相比，LPBF合金具有更细的微观组织和更低的Mn，在干燥空气中氧化速率更低，在空气+ 10% H2O中形成连续Cr2O3结垢速度更快。在温度循环过程中，合金机械强度的差异，以及它们适应高温和氧化诱导应力的能力，以及合金和形成的氧化物(LPBF只适用Cr2O3，铸造试样适用Cr2O3和MnCr2O4)之间热膨胀系数的差异，导致LPBF在800°C干燥空气中比铸造合金更大程度的剥落。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.