Long-term creep behaviours and structural stabilities of austenitic heat-resistant stainless steels

IF 1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials at High Temperatures Pub Date : 2023-09-27 DOI:10.1080/09603409.2023.2263719

O. Öhlin, R. Siriki, G. Chai

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Abstract

ABSTRACTFor heat resistant alloys, long-term structural stability at high temperatures is a critical issue for alloy design and applications. In this paper, the long-term creep behaviours and structural stabilities of six heat resistant high Ni alloys and austenitic stainless steels have been studied. The longest creep rupture life is up to 359 283 hours. High Ni and Cr alloys show a good combination of high creep and oxidation resistances. Precipitation of nano MX particles with a very low growth rate improves long-term creep resistance at high temperatures. Long-term stable multiple nanoprecipitates of MX, Cu-rich, Laves and M23C6 phases can greatly contribute to the creep strength. Low Ni austenitic stainless steels show comparatively low oxidation and creep resistances. It was first found that at 800°C, Cr2N could form in the low Ni steel with a long-term crept by the absorption of nitrogen from the air into the matrix.KEYWORDS: Creepaustenitic stainless steelNi based alloystructural stabilitymicrostructure AcknowledgmentsThis paper is published by permission of Alleima EMEA AB. The supports of Dr Tom Eriksson and Mr Martin Östlund are greatly acknowledged.Disclosure statementNo potential conflict of interest was reported by the author(s).

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奥氏体耐热不锈钢的长期蠕变行为和组织稳定性

摘要对于耐热合金来说，高温下的长期结构稳定性是合金设计和应用的关键问题。本文研究了6种耐热高镍合金和奥氏体不锈钢的长期蠕变行为和组织稳定性。最长蠕变断裂寿命可达359 283小时。高镍铬合金表现出高蠕变和抗氧化性能的良好结合。以极低生长速率析出的纳米MX颗粒提高了高温下的长期抗蠕变性能。长期稳定的MX相、富cu相、Laves相和M23C6相的复合纳米沉淀物对蠕变强度有很大的贡献。低镍奥氏体不锈钢具有较低的抗氧化性和抗蠕变性。首次发现在800℃时，Cr2N可以在低镍钢中形成，并通过从空气中吸收氮进入基体的长期蠕变。关键词:蠕变奥氏体不锈钢镍基合金结构稳定性显微组织致谢本文由Alleima EMEA AB授权发表，并得到Tom Eriksson博士和Martin先生Östlund的大力支持。披露声明作者未报告潜在的利益冲突。

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来源期刊

Materials at High Temperatures 工程技术-材料科学：综合

CiteScore

1.90

自引率

15.40%

发文量

审稿时长

>12 weeks

期刊介绍： Materials at High Temperatures welcomes contributions relating to high temperature applications in the energy generation, aerospace, chemical and process industries. The effects of high temperatures and extreme environments on the corrosion and oxidation, fatigue, creep, strength and wear of metallic alloys, ceramics, intermetallics, and refractory and composite materials relative to these industries are covered. Papers on the modelling of behaviour and life prediction are also welcome, provided these are validated by experimental data and explicitly linked to actual or potential applications. Contributions addressing the needs of designers and engineers (e.g. standards and codes of practice) relative to the areas of interest of this journal also fall within the scope. The term ''high temperatures'' refers to the subsequent temperatures of application and not, for example, to those of processing itself. Materials at High Temperatures publishes regular thematic issues on topics of current interest. Proposals for issues are welcomed; please contact one of the Editors with details.