Rapid Screening of the Mechanical Properties of 13 wt%Cr Steels with Uncharted Combinations of C and N Contents

IF 0.3 Q4 THERMODYNAMICS HTM-Journal of Heat Treatment and Materials Pub Date : 2022-10-01 DOI:10.1515/htm-2022-1020
H. Mahdavi, Ö. Kücükyildiz, K. Dahl, M. Somers, K. Poulios, T. Christiansen, M. Villa
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引用次数: 1

Abstract

Abstract Stainless steels containing both C and N have unique characteristics while requiring unconventional manufacturing methods. This latter feature also translates into a lack of systematic investigations into their properties. In this work, a series of 13 wt%Cr steels with various interstitial solid solutions of C and N was synthesized by high temperature solution nitriding, HTSN, of commercial 13 wt%Cr martensitic steels. Light optical microscopy was applied to reveal the microstructural features, which consisted of a combination of martensite and austenite in various ratios depending on the C and N content. The mechanical response was characterized by nanoindentation. Data analysis assumed a fixed hardening exponent and provided an estimate of the yield strength and Young’s modulus of the synthesized steels and their microstructural components. The comparison with literature data indicated that this estimate is sound for martensite, while the data for austenite suggests an underestimation of the hardening exponent for this phase. The investigation demonstrates the potential of HTSN for the synthesis of novel 13 wt%Cr steels alloyed with both C and N. Moreover, it suggests that the use of nanoindentation for extracting the mechanical properties is limited by the non-uniqueness of the method with regard to the hardening exponent.
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13wt %Cr钢的力学性能的快速筛选及C和N含量的未知组合
含碳氮的不锈钢具有独特的性能,但需要非常规的制造方法。后一种特征也意味着缺乏对其性质的系统研究。本文以13wt %Cr马氏体钢为原料,采用高温渗氮法制备了一系列具有不同间隙固溶体C和N的13wt %Cr钢。通过光学显微镜观察发现,随着碳氮含量的增加,合金的显微组织由不同比例的马氏体和奥氏体组成。力学响应以纳米压痕表征。数据分析假设一个固定的硬化指数,并提供了合成钢及其显微组织成分的屈服强度和杨氏模量的估计。与文献数据的比较表明,这一估计对马氏体是合理的,而奥氏体的数据表明,这一相的硬化指数被低估了。研究表明,HTSN在合成含C和n合金的新型13wt %Cr钢方面具有潜力。此外,研究表明,纳米压痕提取力学性能的方法受到硬化指数非唯一性方法的限制。
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CiteScore
1.50
自引率
33.30%
发文量
43
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