Influence of martensitic islands on fracture behaviour of high heat input weld HAZ

Suzuki, Shinichi; Kamo, Takahiro; Komizo, Yu-ichi

doi:10.1080/09507110802542817

Cited by 17 publications

(5 citation statements)

References 6 publications

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“…Due to significant microstructural embrittlement, the coarse grain heat-affected zone (CGHAZ) of the base low-carbon structural steel is the most susceptible to cracking [10,11]. However, no cracks were observed in the CGHAZ of the dissimilar ferritic/austenitic steel joint in the present study, as shown in Fig.…”

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confidence: 48%

Microstructure and Mechanical Properties of an Underwater Wet Welded Dissimilar Ferritic/Austenitic Steel Joint

et al. 2015

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EH40 ship steel was underwater wet-welded by shielded metal-arc welding at a depth of 7 m in the open sea, using austenitic electrodes. The microstructure and mechanical properties of the joint were estimated with microhardness measurements, bending and tensile testing, optical microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The highest microhardness was recorded on the coarse-grained heat-affected zone of the base metal, which displayed a mixed bainite-martensite microstructure, while the welds possessed a fully columnar dendritic austenitic structure. The specimens exhibited higher ultimate strength and elongation in longitudinal tensile tests than in transverse ones. Moreover, the specimens satisfied face bending tests but failed in root bending ones. Hydrogen-induced microcracks, which were observed in a lath martensite layer at the fusion boundary, became the fracture initiation region both in bending and transverse tensile tests.

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confidence: 48%

Microstructure and Mechanical Properties of an Underwater Wet Welded Dissimilar Ferritic/Austenitic Steel Joint

et al. 2015

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“…In specimens it was possible to trace river lines back to a single cleavage facet that contained the initiation point. The austenite grain size could not be the controlling factor of the HAZ toughness [4]. Brittle fracture is generally initiated from brittle microstructures, such as M/A constituent.…”

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confidence: 95%

Microstructure and Toughness Properties of Subcritically, Intercritically and Supercritically Heat Affected Zones in X80 Pipeline Steel

Moeinifar

2010

AMR

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The objective of this paper is to study the influence of second peak temperature during simulated welding on properties of the subcritically (S), intercritically (IC) and supercritically (SC) reheated coarse grained heat affected (CGHAZ) zones. This involved heating to a first peak temperature (TP1) of 1400 °C, then reheating to different second peak temperatures (TP2) of 700, 800 and 900 °C with a constant cooling rate of 3.75 °C/s. Toughness of the simulated reheated CGHAZ regions were assessed using Charpy impact testing at 0 and -50 °C. The blocky and connected M/A particles, along prior-austenite grain boundaries, act as a brittle phase for the initiation site of the brittle fracture. Charpy impact results indicated that IC CGHAZ had less absorbed energy with higher transition temperature and hardness.

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“…Increasing the number and size of M/A particles at the grain boundaries leads to the increase of the statistical probability of cracking and the crack propagation. Suzuki et al (2009) have shown austenite grain size could not be the controlling factor of HAZ toughness. LambertPerlade et al (2004) have reported M/A constituents are hard and brittle particles, and usually regarded as the site of crack initiation.…”

Section: Resultsmentioning

confidence: 97%

Role of tandem submerged arc welding thermal cycles on properties of the heat affected zone in X80 microalloyed pipe line steel

Moeinifar

Kokabi

Hosseini

2011

Journal of Materials Processing Technology

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Influence of martensitic islands on fracture behaviour of high heat input weld HAZ

Cited by 17 publications

References 6 publications

Microstructure and Mechanical Properties of an Underwater Wet Welded Dissimilar Ferritic/Austenitic Steel Joint

Microstructure and Mechanical Properties of an Underwater Wet Welded Dissimilar Ferritic/Austenitic Steel Joint

Microstructure and Toughness Properties of Subcritically, Intercritically and Supercritically Heat Affected Zones in X80 Pipeline Steel

Role of tandem submerged arc welding thermal cycles on properties of the heat affected zone in X80 microalloyed pipe line steel

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