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金属学报  2014, Vol. 50 Issue (6): 707-714    DOI: 10.3724/SP.J.1037.2014.00003
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锻态TC18钛合金棒材中β相组织和织构特征研究*
李凯1, 杨平1(), 沙爱学2, 颜孟奇2
1 北京科技大学材料科学与工程学院, 北京 100083
2 中航工业北京航空材料研究院, 北京 100095
INVESTIGATION OF MICROSTRUCTURE AND TEXTURE OF β PHASE IN A FORGED TC18 TITANIUM ALLOY BAR
LI Kai1, YANG Ping1(), SHA Aixue2, YAN Mengqi2
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2 Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China, Beijing 100095
引用本文:

李凯, 杨平, 沙爱学, 颜孟奇. 锻态TC18钛合金棒材中β相组织和织构特征研究*[J]. 金属学报, 2014, 50(6): 707-714.
Kai LI, Ping YANG, Aixue SHA, Mengqi YAN. INVESTIGATION OF MICROSTRUCTURE AND TEXTURE OF β PHASE IN A FORGED TC18 TITANIUM ALLOY BAR[J]. Acta Metall Sin, 2014, 50(6): 707-714.

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摘要: 

针对α/β型TC18钛合金大型锻棒中心与边部的性能差异, 利用EBSD技术研究了β相的组织差异、织构差异及形变程度差异, 并考察了β相的这些差异对遵循Burgers关系的αp相取向及球化速率的影响. 结果表明, 锻态TC18钛合金中的β相处于不同程度的形变状态, 随位置不同而具有不同的织构, 中心位置β相具有再结晶织构<100>的特点, 并且存在显著的晶粒尺寸不均匀性, 这些因素对中心与边部的性能差异有主要贡献. αp相的球化过程主要在β相晶内亚晶界上完成, 前期随形貌由片状向方块状的变化, 取向关系变化很小; 后期向球形过渡时, 取向关系偏差较大. β相晶粒内的取向差是衡量加工硬化对强度贡献的有效参数, 而α/β两相的取向关系与理想Burgers关系的偏差是揭示球化速度和形变β相晶粒回复程度的有效参数.

关键词 钛合金锻造织构相变    
Abstract

To understand the differences in the mechanical properties between the center and surface regions of large size forged TC18 titanium alloy bar, electron backscatter diffraction (EBSD) technique is applied to reveal the differences in textures and strains in β phase in addition to the microstructures observation. The influence of the states of β phase on the deviation to the Burgers orientation relationship (OR) between α/β phases is also analyzed according to the acquired EBSD information. It is found that the β phases in different positions of forged bar are in different states of strain, textures and grain sizes. The β phase in the center shows strong <100> texture and coarse and inhomogeneous grain sizes which all contribute to the difference in properties. The spheroidization of αp phase proceeded mainly within β grains at subgrain boundaries and the OR between two phases changed slightly as the lamella αp phase transforms into block-like αp phase, but changed strongly during transforming to globular morphology. The misorientation in β phase is an effective parameter to evaluate the contribution of work-hardening state for the enhancement of strength, whereas the level of the deviation to Burgers OR is an effective parameter to evaluate the spheroidizing rate and the recovery extent.

Key wordstitanium alloy    forging    texture    phase transformation
收稿日期: 2014-01-02     
ZTFLH:  TG146.23  
作者简介: null

作者简介: 李凯, 男, 1989年生, 硕士生

图1  TC18钛合金锻造棒材不同部位的SEM像
图2  棒材各部位β相低倍EBSD取向成像图和极图
图3  中心区域高倍EBSD取向成像图和对应极图
图4  R/2位置EBSD取向成像图和对应极图
图5  边部EBSD取向成像图和对应极图
图6  不同部位β相与α相之间偏离Burgers取向关系的相界分布图
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