摘要
为了研究焊接热输入对高硼铁基堆焊合金组织结构及力学性能的影响,利用CO2/MAG焊,采用FeCr-C-B系金属粉芯焊丝制备高硼铁基堆焊合金,利用力学试验机、硬度仪、光学显微镜、扫描电镜及X射线衍射仪等研究了堆焊合金的组织形貌、力学性能及析出相的变化。结果表明:高硼铁基堆焊合金由(Fe,Cr)、(Fe,Cr)2B和(Fe,Cr)3(C,B)相组成,随着热输入的增加,初晶(Fe,Cr)和(Fe,Cr)2B体积分数增加,(Fe,Cr)3(C,B)相减少,堆焊合金的冲击韧性增加,当热输入为220.8 k J/m时冲击功达到最大298 J;堆焊合金的宏观硬度取决于(Fe,Cr)、(Fe,Cr)2B和(Fe,Cr)3(C,B)的体积分数,当热输入为220.8 k J/m时获得堆焊合金的最小洛氏硬度59 HRC。
For studying the influence of welding heat input on the structure and mechanical properties of high-boron iron-based surfacing alloy,the high-boron iron-based surfacing alloy was prepared by CO2/MAG welding system with Fe-Cr-C-B metal powder cored wire.Mechanical testing machine,hardness tester,optical microscope,scanning electron microscope and X-ray diffraction were employed to investigate the microstructure,mechanical properties and precipitation phase of the surfacing alloy.Results showed that the high boron-iron surfacing alloy consisted of(Fe,Cr),(Fe,Cr)2B and(Fe,Cr)3(C,B)phases.With the increase of heat input,the volume fraction of primary crystal(Fe,Cr)and(Fe,Cr)2B increased,while the(Fe,Cr)3(C,B)phase decreased.As the heat input increased,the impact toughness of the surfacing alloy increased.When the heat input was 220.8 kJ/m,the impact energy reached a maximum of 298 J.Moreover,the microhardness of the surfacing alloy depended on the volume fraction of(Fe,Cr),(Fe,Cr)2B and(Fe,Cr)3(C,B).When the heat input was up to 220.8 kJ/m,the Rockwell hardness of the surfacing alloy declined to the minimum value of 59 HRC.
作者
苏健晖
吴卓伦
唐彪
庄明辉
李冰
马振
杨彪
SU Jian-hui;WU Zhuo-lun;TANG Biao;ZHUANG Ming-hui;LI Bing;MA Zhen;YANG Biao(School of Materials Science and Engineering,Jiamusi University,Jiamusi 154007,China;Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai 264209,China)
出处
《材料保护》
CAS
CSCD
北大核心
2020年第3期36-40,共5页
Materials Protection
基金
黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2016203)
黑龙江省大学生创新创业训练计划项目(201810222053)资助。
