Super304H耐热钢时效过程中的奥氏体晶粒长大及力学性能

doi:10.13251/j.issn.0254-6051.2023.01.018

金属热处理 ›› 2023, Vol. 48 ›› Issue (1): 105-111.DOI: 10.13251/j.issn.0254-6051.2023.01.018

Super304H耐热钢时效过程中的奥氏体晶粒长大及力学性能

吴跃^1,2

1.大唐锅炉压力容器检验中心有限公司, 安徽合肥 230088;
2.中国大唐集团科学技术研究总院有限公司华东电力试验研究院, 安徽合肥 230088

收稿日期:2022-08-15 修回日期:2022-11-07 出版日期:2023-01-25 发布日期:2023-02-03
作者简介:吴跃(1989—),男,工程师,硕士,主要研究方向为电站金属部件的检验和失效分析,E-mail:anhuiwuyuegongda@163.com。
基金资助:
中国大唐集团科学技术研究院有限公司重点项目(KY-2021-03)

Austenite grain growth and mechanical properties of Super304H heat-resistant steel during aging process

Wu Yue^1,2

1. Datang Boiler Pressure Vessel Inspection Center Co., Ltd., Hefei Anhui 230088, China;
2. East China Electric Power Test and Research Institute, China Datang Corporation Science and Technology Research Institute Co., Ltd., Hefei Anhui 230088, China

Received:2022-08-15 Revised:2022-11-07 Online:2023-01-25 Published:2023-02-03

摘要/Abstract

摘要： 对经过预变形和短时固溶处理得到的不同晶粒度Super304H管材进行750 ℃×129 h高温时效处理,以模拟Super304H钢管长时服役过程的奥氏体晶粒长大。采用OM、EBSD、TEM等测试手段表征了奥氏体晶粒晶界特征,探讨了时效过程中奥氏体晶粒长大机制;通过室温及高温拉伸测试研究了时效后不同奥氏体晶粒尺寸对Super304H钢力学性能的影响。结果表明,经预变形和短时固溶后,Super304H耐热钢管试样主要织构为<111>//RD(Rolling direction),时效过程中该取向的奥氏体晶粒以吞噬其他高畸变晶粒为代价进一步生长;经高温时效后,Super304H钢管试样室温、高温拉伸性能随着晶粒尺寸的增大均呈下降趋势,伸长率随晶粒尺寸增大下降明显。伸长率可作为服役态Super304H耐热钢管金属监督的重点指标。

关键词: Super304H耐热钢, 时效, 晶粒长大, 织构, 力学性能

Abstract: Super304H heat-resistant steel tube with different grain sizes obtained by pre-deformation and short-time solution treatment was aged at 750 ℃ for 129 h to simulate austenite grain growth of the Super304H steel tube during long-term service. The characteristics of austenite grain were characterized by means of OM, EBSD and TEM, and the mechanism of austenite grain growth during aging was revealed. The effect of different austenite grain sizes on room-temperature and high-temperature mechanical properties of the specimens was investigated. The results show that main texture of the Super304H steel tube after pre-deformation and short-time solution is <111>//RD (Rolling direction), and the oriented austenite grains furtherly grow at the cost of swallowing other highly distorted grains during aging. After high temperature aging, the tensile properties at room temperature and high temperature of the Super304H heat-resistant steel tube decrease monotonically with the increase of grain size, and the elongation decreases significantly with the increase of grain size. The elongation can be used as the key index of metal supervision of the Super304H heat-resistant steel tube in service.

Key words: Super304H heat-resistant steel, aging, grain growth, texture, mechanical properties

中图分类号:

TG142.73

吴跃. Super304H耐热钢时效过程中的奥氏体晶粒长大及力学性能[J]. 金属热处理, 2023, 48(1): 105-111.

Wu Yue. Austenite grain growth and mechanical properties of Super304H heat-resistant steel during aging process[J]. Heat Treatment of Metals, 2023, 48(1): 105-111.

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Super304H耐热钢时效过程中的奥氏体晶粒长大及力学性能

Austenite grain growth and mechanical properties of Super304H heat-resistant steel during aging process

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