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Effect of Heat Treatment Temperature on Microstructure and Properties of PM Borated Stainless Steel Prepared by Hot Isostatic Pressing
Authors:Yanbin Pei  Xuanhui Qu  Qilu Ge  Tiejun Wang
Affiliation:1.Graduate School, Central Iron & Steel Research Institute, Beijing 100081, China;2.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;3.Technology Department, Antai-Heyuan Nuclear Energy Technology & Materials Co., Beijing 100094, China;4.Technology Centre, Advanced Technology & Materials Co., Ltd., Beijing 100081, China;
Abstract:Borated stainless steel (BSS) with a boron content of 1.86% was prepared by a powder metallurgy process incorporating atomization and hot isostatic pressing. After solution quenching at 900–1200 °C, the phase composition of the alloy was studied by quantitative X-ray diffraction phase analysis. The microstructure, fracture morphology, and distributions of boron, chromium, and iron in grains of the alloy were analyzed by field-emission scanning electron microscopy with secondary electron and energy-dispersive spectroscopy. After the coupons were heat treated at different temperatures ranging from 900 to 1200 °C, the strength and plasticity were tested, and the fracture surfaces were analyzed. Undergoing heat treatment at different temperatures, the phases of the alloy were austenite and Fe1.1Cr0.9B0.9 phase. Since the diffusion coefficients of Cr, Fe, and B varied at different temperatures, the distribution of elements in the alloy was not uniform. The alloy with good strength and plasticity can be obtained when the heat treatment temperature of alloy ranged from 1000 to 1150 °C while the tensile strength was about 800 MPa, with the elongation standing about 20%.
Keywords:borated stainless steel   heat treatment   powder metallurgy   hot isostatic pressing   field-emission scanning electron microscopy with energy-dispersive spectroscopy   microstructure   strength and plasticity
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