Effects of Rare Earth, Titanium, and Magnesium Additions on Microstructures and Properties of High-boron Medium-carbon Alloy

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• 作者：Xiao-li SHI ^{kmustsxl@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Ye-hua JIANG ; ^{jiangyehua@kmust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Rong ZHOU
• 关键词：modification ; eutectic borocarbide ; spheroidization ; toughness ; wear resistance
• 刊名：Journal of Iron and Steel Research, International
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：23
• 期：11
• 页码：1226-1233
• 全文大小：5929 K

文摘

In order to improve the toughness and wear resistance of high-boron medium-carbon alloy (HBMCA), a novel wear-resistant HBMCA comprising granular borocarbide was obtained by titanium, magnesium, and rare earth modifications. These modifications gave rise to greatly refined as-cast eutectic borocarbide structures and a less interconnected continuous borocarbide network. Heat treatment mostly produced broken and spheriodized borocarbides that tended to exist as isolated particles in modified HBMCA. The heat treated modified HBMCA exhibited enhanced hardness than pristine and impact toughness was improved significantly to 12.5 J/cm². In addition, it displayed 2.39 and 1.7 times greater wear resistance than high-speed steel (HSS) and high nickel-chromium alloy steel (Cr25) at high temperature (500 °C), respectively. Here, the modification mechanisms involving Re₂O₃, TiN, and MgO/MgS heterogeneous nuclei were discussed.