Effect of Fast Multiple Rotation Rolling on Microstructure and Properties of Ti6Al4V Alloy

doi:10.1007/s12204-021-2395-0

Abstract

Abstract: Using fast multiple rotation rolling (FMRR), a nanostructure layer was fabricated on the surface of Ti6Al4V alloy. The microstructure of the surface layer was investigated using optical microscopy, transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. The results indicated that a nanostructured layer, with an average grain size of 72—83 nm, was obtained in the top surface layer, when the FMRR duration was 15 min. And the average grain size further reduced to 24—37 nm when the treatment duration increased to 45 min. High density dislocations, twins, and stacking faults were observed in the top surface layer. The microhardness of FMRR specimen, compared with original specimen, was significantly increased. A uniform, continuous and thicker compound layer was obtained in the top surface of FMRR sample, and the diffusion speed of N atom in the top surface layer was accelerated. FMRR treatment provides corrosion improvement.

Key words: fast multiple rotation rolling (FMRR), nanostructure layer, Ti6Al4V alloy, high density dislocation, plasma nitriding, low temperature

摘要： 采用快速多重旋转碾压技术（FMRR）在Ti6Al4V钛合金表面制备了纳米结构层。利用光学显微镜术、透射电子显微镜术、扫描电子显微镜术、X射线衍射等方法对表层组织结构进行分析。结果表明，当FMRR处理时间为15 min时，在表层获得纳米层，平均晶粒尺寸为72~83 nm。当FMRR处理时间增加到45 min时，晶粒得到进一步细化，平均晶粒尺寸为24~37 nm。在表层发现高密度位错、孪晶和层错等结构缺陷。与原始试样相比，FMRR处理后试样的显微硬度显著增加。在FMRR处理后的试样表层得到了均匀、连续并具有一定厚度的化合物层，同时表层N原子的扩散速度增加。FMRR处理改善了基体的耐蚀性。

关键词: 快速多重旋转碾压技术；纳米结构层；Ti6Al4V钛合金；高密度位错；等离子渗氮；低温

CLC Number:

TG 174.4

YANG Xiaojie, (杨晓洁), CHANG Xueting∗ (常雪婷), FAN Runhua (范润华). Effect of Fast Multiple Rotation Rolling on Microstructure and Properties of Ti6Al4V Alloy[J]. J Shanghai Jiaotong Univ Sci, 2023, 28(2): 264-269.

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