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

doi:10.13251/j.issn.0254-6051.2023.01.018

Abstract

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

CLC Number:

TG142.73

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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