Ti变质处理对高硼铁基合金组织和性能的影响  

Effects of Ti Modification on Microstructure and Mechanical Properties of High Boron Iron-Based Alloy

作　　者：张琦 李润霞[1] 郑开宏 王海艳 王娟 郑志斌 ZHANG Qi1,2, LI Runxia1, ZHENG Kaihong2, WANG Haiyan2, WANG Juan2, ZHENG Zhibin2(1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China; 2 Guangdong Institution of Materials and Processing, Guangzhou 510650, Chin)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]广东省材料与加工研究所,广东广州510650

出　　处：《铸造技术》2018年第3期502-505,511,共5页Foundry Technology

基　　金：广东省科技计划项目国际科技合作领域资助项目(2014B050503007);广东省科技计划项目省属科研机构改革创新领域资助项目(2016B070701024);广东省科技计划项目产学研合作项目资助(2016B090918072);广东省软科学研究计划项目资助(2015A080803007);广州市科技计划项目产学研协同创新重大专项资助项目(201508010061);广州市科技计划项目产学研协同创新重大专项资助(201604046009)

摘　　要：借助光学显微镜、扫描电镜和X射线衍射分析等手段,研究了Ti变质处理对高硼铁基合金凝固组织和力学性能的影响。结果表明,高硼铁基合金组织由铁素体、珠光体和沿晶界呈网状分布的硼化物组成。经Ti变质处理后,基体组织得到了细化,硼化物变细变短,出现缩颈和断网现象,部分硼化物呈粒状分布。随着Ti含量的增加,硼化物细化和断网现象更加明显,合金的硬度提高不大,但冲击韧度显著提高,当Ti含量为0.4%时,合金硬度为45.0 HRC,冲击韧度为6.2 J/cm^2。The effects of Ti modification on microstructure and mechanical properties of high boron iron-based alloy were investigated by OM, SEM and XRD. The results show that the microstructure of high boron iron-based alloy consists of ferrite, pearlite and boride that distributes reticular along the grain boundaries. After Ti modification, the matrix is refined, boride becomes thinner and shorter, necking and net-broken boride is observed, the distribution of part of boride is granular. With the increase of Ti content, more refined and net-broken boride is found, the hardness of the alloy increases not obviously but the impact toughness increases much, when Ti content is 0.4%, the hardness is 45.0 HRC and the impact toughness is 6.2 J/cm^2.

关 键 词：Ti变质处理 高硼铁基合金 显微组织 力学性能 

分 类 号：TG251[金属学及工艺—铸造]