Microstructure and brittleness analysis of FeCrAl stainless steel by hot isostatic pressing

doi:10.13251/j.issn.0254-6051.2021.05.002

Abstract

Abstract: The equilibrium phase composition of the two FeCrAl stainless steel parent alloys with different aluminum content was calculated and analyzed by using Thermo-calc software. The microstructure and mechanical properties of the FeCrAl stainless steel prepared by powder atomization and hot isostatic pressing(HIP) were observed and studied by means of optical microscope, SEM and EDS. The results show that the matrix phase of the tested steel is α phase with BCC structure, and the peak precipitation temperature of MC carbide is about 700 ℃, and its ultimate precipitation amount(mass fraction) is about 0.8%. It is mainly distributed along the grain boundary of the ferrite matrix in a chain pattern, and easy to cohere in the triple line boundary and other high-energy regions. The MC carbide precipitation of the hexagonal structure with fewer slip systems and hard texture is the main reason for impacting brittle fracture of HIP FeCrAl stainless steel at room temperature. After annealing at 800 ℃ and water cooling, the MC carbide precipitation of HIP FeCrAl stainless steel can be reduced and the impact property of it can be improved.

Key words: FeCrAl stainless steel, carbide, hot isostatic pressing(HIP), brittle fracture

CLC Number:

TG141

Bao Shun, Liu Rongpei, Feng Han, Nai Qiliang, Jia Jian, Zhu Yuliang, Song Zhigang. Microstructure and brittleness analysis of FeCrAl stainless steel by hot isostatic pressing[J]. Heat Treatment of Metals, 2021, 46(5): 9-13.

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