Microstructure and properties evolution of Nb-bearing medium Cr wear-resistant cast steel during heat treatment
忍受 Nb 中等 Cr 穿抵抗的演员组钢的微观结构和性质进化在热处理期间作者机构：School of Materials Science and EngineeringShanghai UniversityShanghai 200444China
出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)
年 卷 期：2021年第28卷第6期
页 面：739-751页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：Wear-resistant steel Quenching temperature Cooling condition Carbide Retained austenite Strengthening Toughening
摘 要：The effect of quenching temperature and cooling conditions on the microstructure and mechanical properties of a 0.2%Nb medium chromium wear-resistant cast steel was *** microstructure,carbides and volume fraction of retained austenite were characterized using the optical microscope,scanning electron microscope,transmission electron microscope and X-ray *** influence of heat treatment on hardness,impact toughness and tensile properties of test steel was *** can be observed that lath martensite can be obtained under the condition of air cooling and oil cooling upon austenitizing in the range of 900–1020℃.Total carbide content of 0.2–1.1 wt.%under air cooling is more than that under oil cooling due to the lower cooling ***6C5,M23C6 and M7C3 were found at lower austenitizing temperature,of which niobium carbide mostly located at grain boundaries,while chromium carbides were uniformly distributed in the matrix with the size of 20–50 *** chromium carbides are basically dissolved into the matrix in test steel austenitized at 1020°***,the negligible growth of prior austenite grain size is *** austenitized at 1020℃ and cooled in air+tempered at 200℃ has a best combination of hardness,plasticity and tensile strength due to fine grain size and more amount of retained *** this condition,the hardness is 58 HRC,the impact toughness is 22.92 J/cm^(2),and the tensile strength is 1136.9 MPa.
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