Evolution of Microstructure During Double-Sided Friction Stir Welding of Microalloyed Steel

被引：9

作者：

Baker, T. N. ^{[1
]}

Rahimi, S. ^{[2
]}

Wei, B. ^{[3
]}

He, K. ^{[3
]}

McPherson, N. A. ^{[1
]}

机构：

[1] Univ Strathclyde, Dept Mech & Aerosp Engn, 75 Montrose St, Glasgow G1 1XJ, Lanark, Scotland

[2] Univ Strathclyde, AFRC, 85 Inchinnan Dr, Glasgow PA4 9LJ, Lanark, Scotland

[3] Cent S Univ, Electron Microscopy Lab, Adv Res Ctr, Changsha 410083, Hunan, Peoples R China

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2019年 / 50A卷 / 06期

基金：

中国国家自然科学基金;

关键词：

STRAIN-INDUCED PRECIPITATION; ULTRAFINE-GRAINED FERRITE; MECHANICAL-PROPERTIES; STAINLESS-STEEL; PEARLITIC STEEL; DYNAMIC RECRYSTALLIZATION; CRYSTALLOGRAPHIC TEXTURE; RESIDUAL-STRESS; CARBON; DEFORMATION;

D O I：

10.1007/s11661-019-05184-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructures observed by analytical scanning and transmission electron microscopy in the overlap region of a double-sided friction-stir-welded microalloyed steel (EH46) were recorded in detail. They are compared with microstructures in the thermomechanically affected region of the weld and with the base material. The differences suggest that the overlap region has been stirred in the single-phase ferrite, and consists mainly of small equiaxed ferrite grains with strain-induced precipitates, while the thermomechanically affected zone was processed in the austenite-ferrite-phase field, resulting in a mixture of bainite lath packets and ferrite grains. The almost complete absence of pearlite or cementite in the overlap region has led to the suggestion that it dissolved during friction stir welding, providing carbon for strain-induced precipitation. Also, in the complex microstructures of the overlap region, ferrite grains containing a high density of cell-like structures were observed, some of them having precipitates nucleated on their intersections. This implies that strain-induced continuous dynamic recrystallization has occurred. (C) The Author(s) 2019

引用

页码：2748 / 2764

页数：17

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