Friction stir welding of duplex stainless steels

被引：16

作者：

Santos, Tiago Felipe de Abreu ^{[1
,2
,3
]}

Torres, Edwar Andrés ^{[2
,3
,4
]}

Ramirez, Antonio Jose ^{[2
,3
,5
]}

机构：

[1] Department of Mechanical Engineering, Pernambuco Federal University–UFPE, Recife, Brazil

[2] Faculty of Mechanical Engineering, Campinas State University–UNICAMP, Campinas, Brazil

[3] National Nanotechnology Laboratory, LNNano/CNPEM, Campinas, Brazil

[4] Department of Mechanical Engineering, Antioquia University, Medellín, Colombia

[5] Department of Materials Science and Engineering, The Ohio State University, Columbus,OH, United States

来源：

Welding International | 2018年 / 32卷 / 02期

基金：

巴西圣保罗研究基金会;

关键词：

Grain refinement - Heat affected zone - Corrosion resistance - Research laboratories - Ferrite - Tribology - Alloying elements - Solidification - Grain size and shape - Microstructure - Weld decay - Desalination - Friction - Tensile testing - Steel corrosion - Tensile strength;

D O I：

10.1080/09507116.2017.1347323

中图分类号：

学科分类号：

摘要：

Duplex stainless steels are successful in a variety of applications such as the food industry, petrochemicals and plants for desalination of seawater, where high corrosion resistance and high mechanical strength are required. However, the beneficial microstructure may change during fusion welding steps, and it can compromise the performance of these materials. Friction stir welding is a solid-state process avoiding typical problems concerning solidification such as solidification cracks, liquation and segregation of alloying elements. Superduplex stainless steels can avoid unbalanced proportions of ferrite and austenite, formation of secondary deleterious phases and grain growth of ferrite in the heat-affected zone. Consolidated friction stir welded joints with full penetration 6 mm thick were obtained for UNS S32101 and S32205 duplex and S32750 and S32760 superduplex stainless steels. The friction stir welds were submitted to tensile tests indicating an improvement of strength in welded joints, showing increased yield and tensile strength for all studied cases. Regarding the microstructural characterization, an outstanding grain refinement was observed in the welded joint, achieving grain sizes as small as 1 μm. This refinement was associated with the combination of microstructural restoration mechanisms in the dual-phase microstructure promoted by severe deformation associated with a high temperature during the welding process. © 2017 Informa UK Limited, trading as Taylor & Francis Group.

引用

页码：103 / 111