Effect of temperature on the fracture behaviour of heat-treated Al-Cu-Li alloy laser welds under low-cycle fatigue loading

被引：9

作者：

Malikov, Alexander G. ^{[1
]}

Karpov, Evgenij V. ^{[1
,2
]}

Orishich, Anatoliy M. ^{[1
]}

机构：

[1] Russian Acad Sci, Khristianovich Inst Theoret & Appl Mech, Siberian Branch, Inst Skaya Str 4-1, Novosibirsk 630090, Russia

[2] Russian Acad Sci, Lavrentiev Inst Hydrodynam, Siberian Branch, Novosibirsk, Russia

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2020年 / 43卷 / 06期

基金：

俄罗斯科学基金会;

关键词：

aluminium-lithium alloy; fatigue strength; heat treatment; laser welding; microstructure; tensile strength; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; CRACK RETARDATION; ALUMINUM-ALLOY; T-JOINTS; MICROSTRUCTURE; MG; AA2198; PROPAGATION; PREDICTION;

D O I：

10.1111/ffe.13218

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The paper presents the results of the studies of the effect of temperature on the fracture behaviour of Al-Cu-Li alloy laser welds under low-cycle fatigue loading. The mechanical properties and the microstructure of the welded joints without and after postweld heat treatment (PWHT) were investigated. The tensile strength and the low-cycle fatigue resistance of the welded joints were studied at various test temperatures (20 degrees C, 85 degrees C and - 60 degrees C). It was been found that heating up to 85 degrees C and cooling down to -60 degrees C reduced the maximum number of loading cycles of the welded joints after PWHT by 1.5-2.0 times compared with that at a test temperature of 20 degrees C.

引用

页码：1250 / 1261

页数：12

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