Effect of aging time on microstructure and mechanical properties of T91 steel

doi:10.13251/j.issn.0254-6051.2023.01.025

Abstract

Abstract: Microstructure and mechanical properties of T91 steel tube after aging at 680 ℃ for 240, 480, 720, 1200, 1680 and 2160 h were studied by means of optical microscopy, scanning electron microscopy, room temperature tensile testing and hardness testing. The results show that the microstructure of the T91 steel is tempered martensite before and after aging at 680 ℃ for different time, the grain boundaries of microstructure become more and more obvious with the increase of aging time, and the grains become coarser gradually. With the increase of aging time, the hardness of the T91 steel decreases slowly, the lower yield strength and tensile strength decrease first, then increase, then decrease and finally decrease slowly, and the elongation increases first, then decreases and finally decreases slowly. The tensile fracture of the T91 steel changes from microporous fracture to quasi cleavage fracture.

Key words: T91 steel, aging, tensile property, microstructure

CLC Number:

TG142.1

Zhang Renshan, Zhang Peng, Zong Xiaohui, Kang Xueqin. Effect of aging time on microstructure and mechanical properties of T91 steel[J]. Heat Treatment of Metals, 2023, 48(1): 145-148.

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