Effect of Mo on mechanical properties of modified ultrahigh carbon steels after heat-treatment
来源期刊：中南大学学报(英文版)2014年第5期
论文作者：李磊 HU Bin(胡彬) LIU Sheng-gen(刘生根) LIU Hua-shan(刘华山) ZHENG Feng(郑峰)
文章页码：1683 - 1688
Key words：ultrahigh carbon steel; molybdenum; microstructure; impact toughness; hardness
Abstract: Microstructure and mechanical properties of modified ultrahigh carbon (1.6%C) steels with different Mo additions (0, 0.3%, 0.5%, and 0.8%, mass fraction) were studied in their as-cast and quenched then tempered conditions by optical microscopy, scanning electronic microscopy, X-ray diffraction and hardness and toughness tests, respectively. The results show that the continuous eutectic carbide network structure has been broken down and changed to partial isolated and finer particles embedded in matrix of as-cast alloy by modification. Carbides in both quenched and tempered specimens have been refined effectively after the addition of Mo. Specimen containing 0.5% Mo shows the finest microstructures with carbides dispersed homogeneously in martensite matrix and demonstrates highest impact toughness of 18.4 J/cm2 and hardness of 50 HRC.
LI Lei(李磊), HU Bin(胡彬), LIU Sheng-gen(刘生根), LIU Hua-shan(刘华山), ZHENG Feng(郑峰)
(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract:Microstructure and mechanical properties of modified ultrahigh carbon (1.6%C) steels with different Mo additions (0, 0.3%, 0.5%, and 0.8%, mass fraction) were studied in their as-cast and quenched then tempered conditions by optical microscopy, scanning electronic microscopy, X-ray diffraction and hardness and toughness tests, respectively. The results show that the continuous eutectic carbide network structure has been broken down and changed to partial isolated and finer particles embedded in matrix of as-cast alloy by modification. Carbides in both quenched and tempered specimens have been refined effectively after the addition of Mo. Specimen containing 0.5% Mo shows the finest microstructures with carbides dispersed homogeneously in martensite matrix and demonstrates highest impact toughness of 18.4 J/cm2 and hardness of 50 HRC.
Key words:ultrahigh carbon steel; molybdenum; microstructure; impact toughness; hardness
