Effect of post-weld heat treatment on mechanical properties and fatigue crack growth rate in welded AA-2024

被引：46

作者：

Yadav, Vinay Kumar ^{[1
]}

Gaur, Vidit ^{[1
]}

Singh, I. V. ^{[1
]}

机构：

[1] Indian Inst Technol Roorkee, Dept Mech & Ind Engn, Roorkee 247667, Uttar Pradesh, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 779卷

关键词：

Micro-structure; Fatigue; FSW; PWHT; Aluminum; Fracture; FRICTION STIR WELDS; RESIDUAL-STRESS; MICROSTRUCTURAL PROPERTIES; PROPAGATION BEHAVIOR; FRACTURE-TOUGHNESS; PARAMETERS; JOINTS; NUGGET; FSW; 2024-T4;

D O I：

10.1016/j.msea.2020.139116

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this study, effect of post weld heat-treatment (PWHT) at two different aged temperatures was investigated on the microstructure and the material properties of the aluminum alloy 2024. The plates of AA2024 were welded using friction stir welding process, followed by PWHT at different aged conditions: 190 degrees C for 10 hrs and 200 degrees C for 10 hrs. Both tensile and cyclic properties were investigated. PWHT at 200 degrees C-10 h resulted in significant changes in the microstructure and improvement in the mechanical properties of the welded joint. PWHT resulted in re-precipitation of the precipitates, specifically in the thermo-mechanically affected zone (TMAZ) & nugget zone (NZ) but no significant abnormal grain growth was observed in the nugget zone. A significant improvement in the ductility and the hardness of welded joint was observed for PWHT at 200 degrees C-10 h. Long crack growth tests were conducted using sinusoidal loading of 10 Hz frequency and at a stress ratio of 0.1. The PWHT joint at 200-10 h resulted in higher threshold stress intensity factor range (Delta K-th) as compared to as-welded joint and the PWHT joint at 190 degrees C-10 h. The observations are explained based on microstructural changes in the FSW joint and are discussed in this work.

引用

页数：12

共 46 条

[31] High resolution EBSD analysis of the grain structure in an AA2024 friction stir weld [J].

Norman, AF ;

Brough, I ;

Prangnell, PB .

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 2000, 331-3 :1713-1718

[32] Material flow and microstructure in the friction stir butt welds of the same and dissimilar aluminum alloys [J].

Ouyang J.H. ;

Kovacevic R. .

Journal of Materials Engineering and Performance, 2002, 11 (1) :51-63

[33]

Ren SR, 2007, SCRIPTA MATER, V56, P69, DOI [10.1016/j.scriptamat.2006.08.054, 10.1016/j.scriptmat.2006.08.054]

[34] Effects of friction stir welding on microstructure of 7075 aluminum [J].

Rhodes, CG ;

Mahoney, MW ;

Bingel, WH ;

Spurling, RA ;

Bampton, CC .

SCRIPTA MATERIALIA, 1997, 36 (01) :69-75

[35] Effect of post-weld heat treatment on joint properties of dissimilar friction stir welded 2024-T4 and 7075-T6 aluminum alloys [J].

Safarbali, B. ;

Shamanian, M. ;

Eslami, A. .

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 2018, 28 (07) :1287-1297

[36] Effect of cooling environment and welding speed on fatigue properties of friction stir welded Al-Mg-Cr alloy [J].

Singh, Ratnesh Kumar Raj ;

Prasad, Rajesh ;

Pandey, Sunil ;

Sharma, Satish Kumar .

INTERNATIONAL JOURNAL OF FATIGUE, 2019, 127 :551-563

[37] Fatigue crack growth behaviour of friction stir welded AA7075-T651 aluminium alloy joints [J].

Sivaraj, P. ;

Kanagarajan, D. ;

Balasubramanian, V. .

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 2014, 24 (08) :2459-2467

[38] Microstructural properties of friction stir welded and post-weld heat-treated 7449 aluminium alloy thick plate [J].

Sullivan, A. ;

Robson, J. D. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 478 (1-2) :351-360

[39]

Thomas W.M., 1991, Great Britain Patent, Patent No. [9125978.8, 91259788]

[40]

Thomas W.M., 1991, United States, Patent No. [US005460317A, 005460317]

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