The Effect of Advanced Ultrasonic Forging on Fatigue Fracture Mechanisms of Welded Ti-6Al-4V Alloy

被引：2
|
作者：
Smirnova, A. [1 ,2 ]
Pochivalov, Yu. [1 ]
Panin, V. [1 ,2 ]
Panin, S. [1 ,2 ]
Eremin, A. [1 ,2 ]
Gorbunov, A. [2 ]
机构：
[1] Inst Strength Phys & Mat Sci SB RAS, Tomsk 634055, Russia
[2] Natl Res Tomsk Polytech Univ, Tomsk 634050, Russia
来源：
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2017 (AMHS'17) | 2017年 / 1909卷
关键词：
JOINTS; LASER;
D O I：
10.1063/1.5013887
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The current study is devoted to application of advanced postwelding ultrasonic forging to joints formed by laser welding of Ti-6Al-4V alloy in order to enhance their mechanical properties and fatigue durability. Low cycle fatigue tests were performed via digital image correlation technique used to obtain strain fields and in situ characterization of deformation, crack growth and fracture. Fracture surfaces were studied by SEM analysis accompanied with calculation of fracture patterns percentage. The fatigue tests demonstrate the high increase in the number of cycles until fracture (from 17 000 to 32 000 cycles) which could be explained by high ductility of welded material after treatment. This leads to lower fatigue crack growth rate due to higher energy dissipation. The obtained effect is attributable only for small cracks on micro-/mesoscales and fails to play a significant role for macro cracks.
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页数：4
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