淬火冷却方式对高硼中碳合金组织和高温磨损性能的影响  

Effect of Quenching Cooling Ways on Microstructure and High Temperature Wear Performance of High Boron Medium Carbon Alloy

作　　者：李日良[1,2] 岑启宏[1,2] 李祖来[1,2] 蒋业华[1,2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]云南省先进成形制造工程技术中心,云南昆明650093

出　　处：《摩擦学学报》2013年第2期135-141,共7页Tribology

基　　金：国家自然科学基金项目(51171073和51261013);云铜校企预研基金(KKS0201051013)项目资助~~

摘　　要：为研究淬火冷却方式与高硼中碳合金组织转变的关系,对1 000℃空冷、油冷和水冷及500℃回火后的高硼中碳合金进行X射线衍射分析、硬度测试和高温摩擦磨损试验,用电子显微镜与能谱观察和分析其高温磨损的形貌.结果表明:空冷试样的基体为回火索氏体+少量珠光体,Fe2B消失且有较多M3(B,C)析出,而油冷和水冷试样的基体全部为回火索氏体,硬质相主要有MB、M2B型硼化物,随淬火冷却速度的增大,硬质相的体积分数有所下降,基体的微观硬度增大,耐磨性也有所提高;空冷试样在高温摩擦时以直接的氧化磨损为主,油冷试样的氧化剥落减轻,水冷试样的磨损则主要因犁沟变形与氧化-去除共同作用而造成.To investigate the relationships between quenching cooling ways and microstructure transformation of the high boron medium carbon alloy（HBMCA）,the samples were prepared by quenching HBMCA at 1 000 ℃ in three media,i.e.,air,oil and water,followed by tempering at 500 ℃.The microstructure transformation of the samples was analyzed by using X-ray diffraction.The hardness and high temperature tribological performance were investigated.The results show that the matrix of air cooled sample consisted of tempered sorbite,small amount of pearlite and M3（B,C） precipitates.The oil cooled and water cooled samples were composed of tempered sorbite as the matrix and MB and M2B type hard phases.As the cooling rate increased,volume fraction of the hard phase slightly decreased while the hardness and wear resistance increased.The main wear mechanism of air cooled sample was oxidation wear.Oxidation spalling was alleviated for oil cooled sample.For water cooled sample,the wear mechanism was mainly caused by the combined action of furrow deformation and oxidation-removal.

关 键 词：淬火方式 高硼中碳合金 高温磨损 氧化磨损 

分 类 号：TB142.1[一般工业技术]