High cycle fatigue and fracture behavior of Ti-5Al-5Mo-5V-3Cr alloy with BASCA and double aging treatments

被引：32
|
作者：
Campanelli, Leonardo Contri [1 ]
Carvalho Pereira da Silva, Paulo Sergio [1 ]
Bolfarini, Claudemiro [1 ]
机构：
[1] Univ Fed Sao Carlos, Dept Mat Engn, Rod Washington Luiz Km 235, BR-13565905 Sao Carlos, SP, Brazil
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 658卷
基金：
巴西圣保罗研究基金会;
关键词：
Titanium alloy; Beta; Fatigue; Fracture; Microstructure; Precipitation; BETA-TITANIUM ALLOYS; BASKET-WEAVE MICROSTRUCTURE; TI-5AL-5V-5MO-3CR; TOUGHNESS; ALPHA;
D O I：
10.1016/j.msea.2016.02.004
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The fatigue performance of the newly developed Ti-5Al-5Mo-5V-3Cr alloy for aerospace applications in two microstructural conditions was investigated, as well as the fracture surfaces obtained after fatigue tests. High cycle fatigue was assessed based on the standardized staircase method and the corresponding Dixon-Mood statistics. The fatigue limit exhibited an improved result for the microstructure presenting a harder matrix due to the finer and more homogeneous distribution of a phase. Crack nucleation, whether at the surface or subsurface, could be associated to the thickness of the a phase film at grain boundaries. Typical fatigue striations were only found in the basket-weave structure. Unstable crack growth happened in transgranular mode and presented a mixture of cleavage facets and dimpled areas independently of the a phase distribution inside the primary grains. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：203 / 209
页数：7
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