Segregation Behavior ofβ-phase in TC4 Laser Cladding Layer on Ti811 Alloy

Zhang Tiangang; Sun Ronglu; Zhang Hongwei; Xue Peng; An Tongda

doi:10.15980/j.tzzz.2018.01.002

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Segregation Behavior ofβ-phase in TC4 Laser Cladding Layer on Ti811 Alloy
Vol. 38, Issue 1, Pages: 5-9(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.01.002

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[1]张天刚,孙荣禄,张宏伟,薛鹏,安通达.Ti811表面TC4激光熔覆层中β相偏析行为研究[J].特种铸造及有色合金,2018,38(01):5-9.

Zhang Tiangang, Sun Ronglu, Zhang Hongwei, et al. Segregation Behavior ofβ-phase in TC4 Laser Cladding Layer on Ti811 Alloy. [J]. Special Casting & Nonferrous Alloys 38(1):5-9(2018)
[1]张天刚,孙荣禄,张宏伟,薛鹏,安通达.Ti811表面TC4激光熔覆层中β相偏析行为研究[J].特种铸造及有色合金,2018,38(01):5-9. DOI： 10.15980/j.tzzz.2018.01.002.

Zhang Tiangang, Sun Ronglu, Zhang Hongwei, et al. Segregation Behavior ofβ-phase in TC4 Laser Cladding Layer on Ti811 Alloy. [J]. Special Casting & Nonferrous Alloys 38(1):5-9(2018) DOI： 10.15980/j.tzzz.2018.01.002.

摘要

在Ti811合金表面

利用同步送粉激光熔覆技术

制备了TC4激光熔覆层。利用X射线衍射仪、扫描电镜和能谱分析仪等手段分析了涂层组织和β相偏析行为。结果表明

涂层组织出现了典型的β相偏析现象

在涂层中以大块的暗色区域存在;涂层的非β相偏析区微观组织呈现出魏氏体结构

在α-Ti组成的晶界中分布着大量针状马氏体α′-Ti相和少量残留β-Ti相

纳米α

相弥散分布在涂层中;涂层的β相偏析区域出现了大面积残留β-Ti相

晶界α-Ti相和针状马氏体α′-Ti相的特征和数量明显减少

主要是因为激光熔覆形成的熔池冷却速度极快

原始β晶粒来不及相变所导致。

Abstract

The TC4 laser cladding layer was prepared on the surface of Ti811 alloys with coaxial powder feeding.The microstructure andβ-phase segregation of the coating were analyzed by using X-ray diffraction（XRD）

scanning electron microscope（SEM）and energy dispersive spectrometer（EDS）.The results reveal that

the typicalβ-phase segregation occurs in the cladding layer and appears as the large dark area.The microstructure of the non-β-phase segregation region of the cladding layer shows a typical widmanstatten structure.Many accicular martensiticα′-Ti and trace residualβ-Ti are distributed in the grain boundaries ofα-Ti

and nano particles ofα2 phase are dispersed in the cladding layer.In theβ-phase segregation region of the coating

a large area of residualβ-Ti appears in the microstructure while the grain boundaries ofα-Ti and accicular martensiticα′-Ti are obviously reduced

which are attributed to the molten pool formed by laser cladding cooling in a vary fast way and leaving no time for the phase transition of originalβgrains.