Journal ArticleDOI
Superior fatigue crack growth properties in newly developed weld metal
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TLDR
In this paper, a low transformation temperature welding wire is used to transform from austenite to martensite at about 180°C and finish it at room temperature, which induces a compressive residual stress around the welded part.About:
This article is published in International Journal of Fatigue.The article was published on 1999-09-01. It has received 73 citations till now. The article focuses on the topics: Crack closure & Stress concentration.read more
Citations
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Journal ArticleDOI
Recent advances in friction-stir welding : Process, weldment structure and properties
TL;DR: In this article, the authors deal with the fundamental understanding of the process and its metallurgical consequences, focusing on heat generation, heat transfer and plastic flow during welding, elements of tool design, understanding defect formation and the structure and properties of the welded materials.
Journal ArticleDOI
Welding Residual Stresses in Ferritic Power Plant Steels
TL;DR: In this article, the authors review metallurgical issues that arise in ferritic steel welds, relate these to the difficulties in calculating residual stresses, and propose a method to estimate residual stresses in the case of ferritic alloys.
Journal ArticleDOI
Developments in martensitic and bainitic steels: role of the shape deformation
TL;DR: In this paper, a framework which relates the atomic mechanism to the engineering scale is presented, within which the deformation caused by transformation eliminates residual stresses, with extraordinary improvements in the fatigue life of constrained assemblies of metal.
Journal ArticleDOI
Effects of low-temperature transformation and transformation-induced plasticity on weld residual stresses: Numerical study and neutron diffraction measurement
TL;DR: In this paper, the weld residual stresses (RS) in a 25mm thick ferrite steel plate with newly developed low-temperature transformation (LTT) welding wire were investigated by finite element method and neutron diffraction (ND) measurement.
Journal ArticleDOI
Characterizing Phase Transformations and Their Effects on Ferritic Weld Residual Stresses with X-Rays and Neutrons
TL;DR: In this article, the complementary merits of synchrotron X-ray and neutron diffraction are exploited both to verify and refine weld models and to inspire the development of weld filler metals to control weld stresses.
References
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Journal ArticleDOI
Fatigue crack closure under cyclic tension
TL;DR: In this article, an analysis of the stress distribution acting on the fracture surfaces shows that the local compressive stress maxima may exceed the yield stress of the material and that crack closure may influence the shape of the striation pattern.
Book ChapterDOI
The Significance of Fatigue Crack Closure
TL;DR: Al alloy sheet fatigue crack closure under cyclic tensile loading, deriving expression for crack propagation rate in terms of effective stress amplitude as discussed by the authors, was derived for the first time in the literature.
Journal ArticleDOI
Unique fatigue threshold and growth properties of welded joints in a tensile residual stress field
TL;DR: In this article, the authors investigated the fatigue threshold and high growth rate region properties on several kinds of welded joints and found that the unique properties occurred from the fully opened fatigue crack due to the tensile residual stresses.
Journal ArticleDOI
Effect of Residual Tensile Stresses on Threshold Level for Fatigue Crack Propagation in Welded Joints of SM50B Steel
Akihiko Ohta,Etsuo Sasaki,Masahide Kamakura,Masatoshi Nihei,Michio Kosuge,Masao Kanao,Michio Inagaki +6 more
TL;DR: In this article, the authors measured the fatigue crack propagation rate and the stress intensity threshold level on welded joints which were made by three kinds of welding processes, manual arc welding with covered electrode, gas metal arc welding, and submarged arc welding.