Solid-State Phase Transformation and Microstructure of Laser Direct Manufactured TC17 Titanium Alloy Components

被引：0

作者：

Sun Xiaomin ^{[1
]}

Liu Dong ^{[1
]}

Tang Haibo ^{[1
]}

Wang Huaming ^{[1
]}

机构：

[1] Beihang Univ, Minist Educ Laser Direct Mfg Large Metall Compone, Engn Res Ctr, Beijing 100191, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2013年 / 42卷 / 04期

关键词：

TC17; alloy; laser melting deposition; solid transformation; microstructure; INTERFACE PHASE; ALPHA; PRECIPITATION; TECHNOLOGIES;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructure characteristics of the laser melting deposited TC17 titanium alloy components were analyzed by OM, SEM and XRD. The solid-state phase transformation and the microstructure evolution under the effect of laser short term cycle of heating and cooling were researched. Results show that the laser melting deposited TC17 titanium alloy consists of directionally solidified "knuckle" grains and a few equiaxed grains, which are arranged alternately. The microstructure of the laser melting deposited TC17 titanium alloy is fine duplex microstructure composed of irregular primary lamellar alpha and basketwave transformed beta. Solid-phase transformation is shown in the last twelve depositing layers: the microstructure in the last four layers is Martensite; in the 5th to 7th layer is mainly acicular a and a little irregular coarse alpha; in the 8th to 12th layer is coarser and shorter alpha with underdeveloped serrated interface and the second a is fine basketwave microstructure.

引用

页码：724 / 729

页数：6

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