Internal fatigue crack initiation in drawn Ti-6Al-4V wires

被引：6

作者：

Everaerts, J. ^{[1
]}

Verlinden, B. ^{[1
]}

Wevers, M. ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Dept Mat Engn, Kasteelpk Arenberg 44, B-3001 Leuven, Belgium

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2016年 / 32卷 / 16期

关键词：

Fatigue; Titanium; Ti-6Al-4V alloy; Subsurface initiation; Internal initiation; Fish-eye fracture; Facets; Crystallographic texture; HIGH-CYCLE FATIGUE; BETA-TITANIUM-ALLOYS; CRYOGENIC TEMPERATURES; MEAN STRESS; FRACTURE; MICROSTRUCTURE; PROPAGATION; BEHAVIOR; TI6AL4V; GROWTH;

D O I：

10.1080/02670836.2015.1114739

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fatigue cracks in titanium alloys are often found to initiate at faceted alpha grains. In the very high cycle fatigue regime, crack initiation tends to shift from the surface towards the interior of the material, and more initiation facets can be found on the fracture surface. In this study, fatigue tests were performed on drawn and heat-treated Ti-6Al-4V wires. Only a few samples fractured due to interior initiation. The facets at the initiation sites of these samples were not flat, but had markings on the nano-scale, and were highly inclined. A possible explanation for these aspects is the crystallographic texture of the wire, and a reflection is made on the suggested mechanisms of facet formation.This paper is part of a Themed Issue on Euromech 570: Interface-dominated materials.

引用

页码：1639 / 1645

页数：7

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