Effect of duplex aging on microstructure and mechanical behavior of beta titanium alloy Ti-15V-3Cr-3Al-3Sn under unidirectional and cyclic loading conditions

被引：41
|
作者：
Santhosh, R. [1 ]
Geetha, M. [2 ]
Saxena, V. K. [3 ]
Rao, M. Nageswara [2 ]
机构：
[1] VIT Univ, Sch Adv Sci, Vellore 632014, Tamil Nadu, India
[2] VIT Univ, Sch Mech & Bldg Sci, Vellore 632014, Tamil Nadu, India
[3] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2015年 / 73卷
关键词：
Beta titanium alloy; Duplex aging; Microstructure; Work hardening rate; HCF behavior; FATIGUE-CRACK-GROWTH; HEAT-TREATMENT; TI; INITIATION;
D O I：
10.1016/j.ijfatigue.2014.12.005
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The microstructure and mechanical behavior of beta titanium alloy Ti-15V-3Cr-3Al-3Sn (Ti15-3) under unidirectional and high cycle fatigue (HCF) loading conditions were studied after single aging (SA) and duplex aging (DA). After SA, well-developed grain boundary at and micro precipitate free zones (micro PFZs) were present in the microstructure. Whereas after DA, grain boundary at was poorly developed and micro PFZs were absent. DA resulted in smaller size, higher density and volume fraction of alpha particles. DA led to higher work hardening rate, better strength-ductility combination and higher HCF life. Improved mechanical behavior after DA is explained based on microstructural observations. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：88 / 97
页数：10
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