Isothermal aging precipitation behavior of maraging steel

doi:10.13251/j.issn.0254-6051.2022.10.003

Abstract

Abstract: A maraging steel was solution treated at 900 ℃ and then isothermal aged at 500 ℃. The change of microstructure, precipitates and hardness of the tested steel during aging was characterized by means of optical microscope, scanning electron microscope and Vickers hardness tester. On this basis, the effect of aging process on hardening behavior of the tested steel was analyzed. The results show that the hardness of the tested steel increases obviously in the early stage of aging, and reaches the peak value of 585 HV30 when aging for 12 h. With the aging time further extended, the tested steel enters the over-aging state, and the hardness begins to decline slowly. The tested steel matrix is composed of lath martensite and retuined austenite, and the second phase particles are distributed in the matrix. When aging for 0.5 h, the precipitate size is about 5-10 nm; and when aging for 12 h, the precipitate grows slowly to 20-25 nm.

Key words: maraging steel, aging, precipitation, hardening

CLC Number:

TG142.1

Fang Huiliang, Hu Zhiyu, Lü Meng, Wu Jian, Zhai Tingting, Xue Chunjiang, Wang Haiyan. Isothermal aging precipitation behavior of maraging steel[J]. Heat Treatment of Metals, 2022, 47(10): 15-18.

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