Local mechanical properties of intercritically reheated coarse grained heat affected zone in low alloy steel

Haugen, Veronica; Rogne, Bjørn Rune Sørås; Akselsen, Odd M.; Thaulow, Christian; O̸stby, Erling

doi:10.1016/j.matdes.2014.02.010

Cited by 24 publications

(8 citation statements)

References 21 publications

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“…Massive M-A constituents have a greater effect on toughness than slender M-A constituents [10][11][12]. Toughness improves with the increase in slender M-A constituents but decreases with the increase in massive ones [13,14]. However, research has also shown the improvement in toughness is due to the formation of massive M-A constituents [15].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Bai

Ding

Tong

et al. 2019

Metals

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Multi-pass welding is used in high-pressure and thick-walled pipes in natural gas and oil pipelines. When a welding layer of a welded joint is subjected to different welding thermal cycles, its microstructure and properties change, thereby affecting the overall welding performance. In this study, the temperature and microstructural variations of the fill pass 2 (FP2) in the entire welding process were investigated by combining the thermal cycle with the cascade welding method. The original FP2 and FP2 after double thermal cycles had the worse deformation ability by tensile test. The toughness of FP2 improved after a single thermal cycle, decreased after double thermal cycles, and improved again after triple thermal cycles. The content of martensite–austenite (M–A) constituents and the average grain size of FP2 in the cascade samples were inversely proportional to FP2 toughness. Massive M–A constituents and their unique distribution at the inter-critical temperature were harmful to weld metal toughness. Controlling the size and fraction of M–A constituents can improve weld metal toughness.

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Section: Introductionmentioning

confidence: 99%

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Bai

Ding

Tong

et al. 2019

Metals

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“…Hence, very low toughness at subzero temperatures may occur [70,71]. Afterwards, a comprehensive study by Mohseni et al [72][73][74][75] and Haugen et al [76] on brittle crack initiation in the ICCGHAZ confirmed earlier results [77]. In the case of multipass welding (filling passes), reheating of the CGHAZ may induce the formation of brittle martensite-austenite (M-A) islands, i.e., the intercritically reheated CGHAZ (ICCGHAZ).…”

Section: High-strength Low-alloy Steel Hazmentioning

confidence: 83%

Metallurgical Aspects in the Welding of Clad Pipelines—A Global Outlook

2019

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In the present work, the metallurgical changes in the welding of clad pipelines are studied. Clad pipes consist of a complex multi-material system, with (i) the clad being stainless steel or a nickel-based superalloy, (ii) the pipe being API X60 or X65 high-strength carbon steel, and (iii) the welding wire being a nickel-based superalloy or stainless steel in the root and hot pass, with a nickel or iron buffer layer, followed by filling with carbon steel wire. Alternatively, the corrosion resistant alloy may be used only. During production of the clad pipe, at the diffusion bonding temperature, substantial material changes may occur. These are carbon diffusion from the carbon steel to the clad, followed by the formation of hard martensite at the interface on cooling. The solidification behavior and microstructure evolution in the weld metal and in the heat-affected zone are further discussed for the different material combinations. Solidification behavior was also numerically estimated to show solidification parameters and resulting solidification modes.

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“…Most of them focus on the effect of transformation products or/and heat treatment parameters on the toughness. [9][10][11][12][13][14][15][16][17] Few reports study the crystallography of the transformation products. 8,13) The discussion of the transformation products is seldom analyzed from a different angle.…”

Section: Microstructure and Micro Strain In The Cghaz Of 225cr-16w mentioning

confidence: 99%

Microstructure and Micro Strain in the CGHAZ of 2.25Cr-1.6W Steel after Intercritical Heat Treatment

2017

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Local mechanical properties of intercritically reheated coarse grained heat affected zone in low alloy steel

Cited by 24 publications

References 21 publications

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Metallurgical Aspects in the Welding of Clad Pipelines—A Global Outlook

Microstructure and Micro Strain in the CGHAZ of 2.25Cr-1.6W Steel after Intercritical Heat Treatment

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