Fatigue crack growth behavior of the simulated HAZ of 800MPa grade high-performance steel

Kim, Sang-Hoon; Kang, Dong Hee; Kim, Tae−Won; Lee, Jongkwan; Lee, Changhee

doi:10.1016/j.msea.2010.11.089

Cited by 64 publications

(40 citation statements)

References 14 publications

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“…After that, the rest austenite transformed into M/A island completely. Kim et al [2011] found that M/A islands larger than 1μm 2 were the fatigue cracks source and accelerated fatigue crack growth, but the small M/A islands were not deleterious to the fatigue properties. In this study, the area of M/A islands in the FGHAZ was smaller than 1μm 2 , so these islands had no harm to the fatigue behavior of the welded joints.…”

Section: Microstructure Evolutionmentioning

confidence: 90%

Microstructure formation and precipitation in laser welding of microalloyed C–Mn steel

Wang

Chen

Wang

et al. 2015

Journal of Materials Processing Technology

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Section: Microstructure Evolutionmentioning

confidence: 90%

Microstructure formation and precipitation in laser welding of microalloyed C–Mn steel

Wang

Chen

Wang

et al. 2015

Journal of Materials Processing Technology

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“…Welding is widely used in the manufacture of fired boilers, and the microstructure and properties of heat affected zone (HAZ) are more complex than the base metal (BM) and weld metal (WM) due to the presence of microstructure gradients caused by welding thermal cycle [5]. The microstructure evolution and mechanical properties of HAZ have been studied [6][7][8][9][10][11][12][13], but research focused on corrosion behavior and corrosion mechanisms in HAZ is lacking.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

Zhang

Zhao

Shu

et al. 2017

Metals

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Abstract:The microstructure evolution and the corrosion behavior of welding heat affected zone (HAZ) of Q315NS steel in 50 wt % H 2 SO 4 at 20 • C was investigated with thermal simulation technique, surface analysis and electrochemical tests. The microstructure of ferrite and pearlite was observed in base metal (BM), fine grained region (FGHAZ) and inter critical region (ICHAZ) while coarse grained region (CGHAZ) consisted of granular bainite. The CGHAZ exhibited the highest microhardness and the largest average grain size. The passivation process occurred on the surface of all specimens. Different microstructure give birth to different corrosion behaviors between CGHAZ and BM, FGHAZ, ICHAZ. The dense oxide film were formed on the surface of ferrite while oxide film with micro voids were formed on the surface of pearlite in BM, FGHAZ and ICHAZ after immersion in 50 wt % H 2 SO 4 solution for 12 h. The rod-shaped corrosion product was formed on the surface of CGHAZ while the porous-structured corrosion product was formed on the surface of BM, FGHAZ and ICHAZ after immersion in 50 wt % H 2 SO 4 solution for 72 h. The corrosion resistance of BM, CGHAZ, FGHAZ and ICHAZ increased during the first 12 h and then declined slowly with increasing immersion time. The BM had the best corrosion resistance while the CGHAZ had the lowest corrosion resistance throughout the corrosion process.

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“…[6][7][8][9][10][11] Sanghoon Kimand Jun Hu 6,7) have investigated that variation of welding thermal cycles concerning to different peak temperature, single-or multi-pass and cooling time (t 8/5 , defined as the cooling time from 800 to 500°C) in the heat affected zone (HAZ). The HAZ may produce several sub-regions, such as fine grained HAZ (FGHAZ) which has smaller prior austenite grain and martensite packet sizes and can act as effective barriers to crack propagation to improve toughness, coarse grained HAZ (CGHAZ) which was unable to inhibit the crack propagating and intercritically reheated CGHAZ (ICCGHAZ).…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Input on Microstructure and Toughness of Coarse Grained Heat Affected Zone of Q890 Steel

et al. 2016

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Microstructure evolution and impact toughness measurement on a coarse grained heat affected zone (CGHAZ) of Q890steel have been investigated in this study by Gleeble 1 500 simulation technique. The results indicate that a relevant mediate energy input is recommended for welding of Q890 steel, according to a fact that an impact energy as high as 83 J is attained in the CGHAZ with t 8/5 of 20 s. It is related to the cumulative contribution of prior-phase bainitic ferrite separated martensite comprises interlocking structure of laths that can promote a sufficient subdivision of the block and finer effective grain size and the highest density of high angle boundaries. Higher heat input can result in brittle fracture in the CGHAZ since the stress concentration and triaxiality of the neighboring matrix are increased by the hard phase particles such as M-A constituents.KEY WORDS: microstructure; M-A constituents; impact toughness; electron backscattered diffraction (EBSD).

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Fatigue crack growth behavior of the simulated HAZ of 800MPa grade high-performance steel

Cited by 64 publications

References 14 publications

Microstructure formation and precipitation in laser welding of microalloyed C–Mn steel

Microstructure formation and precipitation in laser welding of microalloyed C–Mn steel

Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

Effect of Heat Input on Microstructure and Toughness of Coarse Grained Heat Affected Zone of Q890 Steel

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