Effect of solution treatment and aging on microstructure of low-nickel high nitrogen austenitic stainless steel

doi:10.13251/j.issn.0254-6051.2020.02.023

Abstract

Abstract:

Solid solution treatment and aging of hot rolled low-nickel high nitrogen austenitic stainless steel were carried out. Metallographic microscope, electron backscatter diffraction and phase diagram were used to systematically analyze the microstructure changes of the steel after solid solution treatment and aging. The results show that after solid solution treatment at 1050 ℃, the steel matrix is austenite with nearly equiaxial grains containing a large number of twins, and with a small amount of ferrite. After aging, the precipitated phases are mainly Cr₂N, CrN, and Cr₂₃C₆. With the increase of aging temperature from 650 ℃ to 800 ℃ under the same aging time of 5 h, the amounts of carbides and nitrides increase first and then decrease, reaching to the maximum at 750 ℃. With the increase of aging time in the range of 5-10 h at 750 ℃, the amount of precipitates has little change. The precipitation process of the precipitated phases is as follows: Firstly, cellular precipitation occurs at the triple junctions of grain boundaries. With the extension of aging time, strip precipitates are gradually precipitated at the grain boundaries, and begin to appear and grow up inside the grains, finally form pearlite-like lamellar precipitates.

Key words: low-nickel high nitrogen austenitic stainless steel, solution treatment, aging, microstructure

CLC Number:

TG142.1

Chang Jinbao, Zhao Yingli, Ji Shuang, Zhang Fuli, Yang Xianliang, Pei Jianming. Effect of solution treatment and aging on microstructure of low-nickel high nitrogen austenitic stainless steel[J]. HTM, 2020, 45(2): 120-124.

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