摘要
为了改善TC4钛合金的硬度和耐磨性,采用行星式球磨装置及真空感应渗氮装置,对TC4钛合金进行机械球磨+真空渗氮复合改性处理,利用自制磨损试验机在不同载荷下进行磨损试验研究。结果表明,TC4钛合金经复合强化处理后渗层主要由TiN和Ti相组成,随着渗氮温度的升高,渗层厚度逐渐增厚,截面硬度也得到明显提高。直接渗氮与复合强化处理后的试样渗层组织形态差异大,直接渗氮样渗层薄而致密,与基体分界清晰,缺少过渡。而复合强化样中的氮化物相呈块状或岛状分布在表层,没有明显白亮层。复合强化处理后的截面硬度梯度较直接渗氮处理后的更加平缓,且渗氮层的脆性较小,表面塑性高。复合强化处理后试样的耐磨性显著提升,但略低于直接渗氮试样。
In order to improve the hardness and wear resistance of TC4 titanium alloy,the TC4 titanium alloy was subjected to mechanical lappling and vacuum nitriding composite modification treatment by planetary ball milling device and vacuum induction nitriding device.A self-made wear testing machine was used to conduct wear tests under different loads.The results show that after complex enhancement treatment,the infiltrated layer of the TC4 titanium alloy mainly consists of TiN and Ti phases.With the increase of the nitriding temperature,the thickness of the nitrided layer gradually thickens,and the cross-sectional hardness also significantly improves.There is a significant difference in the microstructure of the nitrided layer between the specimen treated with direct nitriding and composite strengthening.The nitrided layer of the direct nitrided specimen is thin and dense,with a clear boundary with the matrix and a lack of transition.The nitride phase in the composite strengthening specimen is distributed in a block or island like manner in the surface layer,without a clear bright white layer.The hardness gradient of the cross-section after composite strengthening treatment is smoother than that after direct nitriding treatment and the nitrided layer has less brittleness and higher surface plasticity.The wear resistance of the specimen after composite strengthening treatment is significantly improved,but slightly lower than that of the direct nitrided specimen.
作者
邓敏先
代燕
刘港
穆洪
陈涛云
刘静
Deng Minxian;Dai Yan;Liu Gang;Mu Hong;Chen Taoyun;Liu Jing(School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang Guizhou 550025,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第9期225-232,共8页
Heat Treatment of Metals
基金
黔科合基础(ZK[2023]250)
贵州师范大学大创项目(S202110663057)
贵州省研究生教育创新计划(黔教合YJSKYJJ〔2021〕100)。
关键词
TC4钛合金
机械变形
渗氮
复合强化处理
耐磨性
TC4 titanium alloy
mechanical deformation
nitriding
complex enhancement treatment
wear resistance
