Study on Weld Bond of Dissimilar Welded Joint of α- and γ-Steels (2nd report)

博, 井川; 成夫, 新; 昭彦, 中野

doi:10.2207/qjjws1943.43.247

Cited by 3 publications

(5 citation statements)

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“…There were two typical zones formed due to carbon migration from the base metal into the weld metal, [6][7][8]11,25,26 i.e. a hardened, carbon enriched (or carbide enriched) zone which consisted of martensite and large amounts of M 23 C 6 carbides, and a softened, carbon depleted ferrite zone adjacent to the weld interface.…”

Section: Influence Of Post-weld Heat Treatment On Fracture Morphologymentioning

confidence: 99%

“…Their formation mechanisms have been studied elsewhere. 6,[18][19][20][25][26][27] The transition zone exhibited lower ductility when compared with the weld metal.…”

Section: Typical Successive Fractographymentioning

confidence: 99%

“…Obviously, after PWHT, the microstructures in the transition zone changed greatly for both joint systems. There were two typical zones formed due to carbon migration from the base metal into the weld metal, [6][7][8]11,25,26 There was an apparent difference in these two joint systems, i.e. the hardened carbon enriched zone in the 0 .…”

Section: Influence Of Post-weld Heat Treatment On Fracture Morphologymentioning

confidence: 99%

“…25 regions of the HAZ, 23 and a weight function method was applied to treat the effect on fracture of various factors associated with dissimilar material joints where there were spatial differences in yield stress. 11 In the present work, an attempt has been made for the first time to design a non-standard impact specimen to observe the fracture appearance directly over all individual regions in the welded joint, which may provide a more accurate method of evaluating the fractographic and microstructural relationships in a weldment.…”

Section: Introductionmentioning

confidence: 99%

“…Early investigators resorted to various thermal simulation testing techniques to obtain sizeable volumes of material that approximated the individual weld metal, transition zone and HAZ microstructures. 25,26 Other researchers used a shear punch test technique to determine strength and ductility parameters by employing extremely thin specimens extracted from various regions of the HAZ, 23 and a weight function method was applied to treat the effect on fracture of various factors associated with dissimilar material joints where there were spatial differences in yield stress. 11 In the present work, an attempt has been made for the first time to design a non-standard impact specimen to observe the fracture appearance directly over all individual regions in the welded joint, which may provide a more accurate method of evaluating the fractographic and microstructural relationships in a weldment.…”

Section: Introductionmentioning

confidence: 99%

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Direct fractographic and microstructural evaluation of different zones within welded dissimilar steel joints

Pan¹

2005

Materials Science and Technology

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Fractographic and microstructural evaluations of fracture surfaces of different zones within welded dissimilar steel joints are difficult to conduct by conventional methods because of the very small dimensions of the various regions in the joint. In the present paper, a novel non-standard notch impact specimen is introduced. By using this specimen, a cross-sectioned fracture was obtained, and successive variations of the fracture surfaces, corresponding to individual microstructures of all regions in the joint, were clearly identified. When comparing the fracture surface between as welded and post-weld heat treated (PWHT) joints, it was found that the transition zone fractured in a brittle disbonding manner owing to carbon migration, and the location of the poorest part in the joints transferred from the heat affected zone (HAZ) in the as welded state into the transition zone after post-weld heat treatment. The described specimen and analysis approach can be used to conduct other fractographic and microstructural evaluations, such as in tensile tests.

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Section: Influence Of Post-weld Heat Treatment On Fracture Morphologymentioning

confidence: 99%

“…Their formation mechanisms have been studied elsewhere. 6,[18][19][20][25][26][27] The transition zone exhibited lower ductility when compared with the weld metal.…”

Section: Typical Successive Fractographymentioning

confidence: 99%