蠕化率对蠕墨铸铁组织和耐磨性能的影响研究  

Effect of Vermicular Rate on Microstructure and Wear Resistance of Vermicular Cast Iron

作　　者：万浩 金琦 赵振江 许胜 王健 司乃潮[2] 吴奎武[2] WAN Hao;JIN Qi;ZHAO Zhen-jiang;XU Sheng;WANG Jian;SI Nai-chao;WU Kui-wu(School of Naval Architecture and Mechanical-electrical Engineering,Taizhou University,Taizhou 225300,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]泰州学院船舶与机电工程学院,江苏泰州225300 [2]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《稀土》2021年第5期112-118,共7页Chinese Rare Earths

基　　金：江苏省第十六批“六大人才高峰”项目(XCL-265);泰州学院高层次人才科研启动基金项目(TZXY2017QDJJ014);泰州市第五期“311高层次人才培养工程”;江苏省高等学校自然科学研究面上项目(18KJD430007);泰州学院2020年大学生创新创业训练计划项目(2020CXXL050;2020CXXL051;202012917007Z)。

摘　　要：采用镁稀土蠕化剂和含钡孕育剂制备平均蠕化率为55%、65%、75%和85%的蠕墨铸铁,利用金相显微镜观察金相组织,拉伸试验机测试力学性能和扫描电子显微镜(SEM)分析磨面形貌,研究了具有不同蠕化率蠕墨铸铁的金相组织、力学性能和耐磨性能。结果表明,蠕化率提高会引起析出石墨形态的转变,造成球状石墨数量的减少,在平均蠕化率为85%的试样中已基本观察不到球状石墨。蠕化率提高还会造成蠕墨铸铁抗拉强度、伸长率和硬度的下降,平均蠕化率为55%的试样具有最佳的综合力学性能,抗拉强度、伸长率和硬度分别为534 MPa、3.2%和278 HBW。此外,蠕墨铸铁的耐磨性能会随着蠕化率的提高而降低,平均蠕化率为55%的试样在600 N、800 N、1000 N、1200 N载荷下的磨损量均最小,其磨损机制以磨粒磨损为主。The Mg-RE-vermiculizer and inoculant containing barium were used to prepare vermicular cast iron with 55%, 65%, 75% and 85% average vermicular rate. The microstructure, mechanical property and wear surface were characterized by metallographic microscope, tensile testing machine and scanning electron microscope(SEM), respectively. The results show that the increase of vermicularity lead to the change of the morphology of precipitated graphite, resulting in the decrease of the number of nodular graphite. The increase of vermicularity also leads to the decrease of tensile strength, elongation and hardness of vermicular cast iron. The sample with 55% average vermicular rate has the best mechanical property. The tensile strength, elongation and hardness are 534 MPa, 3.2% and 278 HBW, respectively. In addition, the wear resistance of vermicular cast iron decreases with the increase of vermicular rate. Under loads of 600 N, 800 N, 1000 N and 1200 N, the weight loss of sample with 55% average vermicular rate is the smallest. In this case, the main wear mechanism is abrasive wear.

关 键 词：蠕化率 蠕墨铸铁 金相组织 力学性能 磨损性能 

分 类 号：TG25[金属学及工艺—铸造]