TC4-DT损伤容限型钛合金细晶化加工过程组织演变研究  

Research of Microstructure Evolution of Damage Tolerance Titanium Alloy TC4-DT during Grain-Refining and Homogenizing Deformation Process

作　　者：朱知寿[1] 王新南[1] 商国强[1] 李军[1] 费跃[1] 李静[1] 祝力伟[1] 俞汉清[2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]西北工业大学,陕西西安710015

出　　处：《材料科学研究（中英文版）》2014年第4期64-68,共5页Research of Materials Science

基　　金：航空基金支持（2012E62120R,2007ZF21011）.

摘　　要：针对我国大量采用的TC4-DT新型损伤容限型钛合金，研究了大型铸锭与锻坯均匀细化变形过程中的组织演变规律。结果表明，当变形温度在950℃-975℃的β单相区时，随变形量增加和变形温度的逐渐降低，动态再结晶会与晶界α相破碎和晶内细化共同作用，使坯料的组织发生有效的细化和均匀化。该组织演变规律在大型铸锭的开坯锻造和随后的变形过程中得到了进一步的验证。坯料经组织细化后增加了超声波探伤对缺陷的敏感性，提高了准β热处理后片层组织的静力拉伸塑性。低的超声波杂波水平是TC4-DT钛合金损伤容限钛合金大型构件安全可靠使用的基本保障。The microstructure evolution of damage tolerance titanium alloy TC4-DT during grain-refining and homogenizing deformation process has been studied in this paper. The results showed that, when the alloy was deformed at 950℃ -975℃ in single β phase, dynamic recrystallization would occur simultaneously with grain-boundary-phase breaking and inner-grain refining process and would lead to significant grain-refining and homogenizing effects, which had also been verified in the deformation of a TC4 titanium ingot. With the increase of forging deformation, the alloy＇s microstructure was refined with the result of decrease in ultrasonic noise value and increase in tensile plasticity after subsequent quasi-β heat treatment. Low noise value in ultrasonic detection is an important guarantee for safe and reliable applications of large scale aviation-oriented structures

关 键 词：钛合金 损伤容限 再结晶 超声波探伤 细晶组织 

分 类 号：TB[一般工业技术]