Influence of peak temperature during simulation and real thermal cycles on microstructure and fracture properties of the reheated zones

Moeinifar, Sadegh; Kokabi, A.H.; Hosseini, H.R. Madaah

doi:10.1016/j.matdes.2009.12.023

Cited by 91 publications

(49 citation statements)

References 21 publications

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“…It is well known that variation of thermal cycle in the heat affected zone (HAZ) can possibly produce several sub-regions with poor toughness, such as coarse grained HAZ (CGHAZ) and intercritically reheated CGHAZ (ICCGHAZ) (Moeinifar et al, 2010;Mohseni et al, 2014). Peak temperature and subsequent cooling time (t 8/5 , defined as the time for cooling from 800 to 500 • C) herein are the two critical parameters defining those sub-regions.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and toughness of the CGHAZ of an offshore platform steel

Zhou

Jia

Zhang

et al. 2015

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Microstructure and toughness of the CGHAZ of an offshore platform steel

Zhou

Jia

Zhang

et al. 2015

Journal of Materials Processing Technology

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“…It is indicated that, with the heat input decreasing from 60 to 40 kJ/cm, the impact energy remains at a low level due to a relatively high amount of M/A constituents acting (Table 2) as the brittle phase [21,22]. However, it still slightly increases as a result of microstructure refinement (Figures 3-5).…”

Section: Charpy Impact Properties Of the Simulated Cghazmentioning

confidence: 98%

The Role of the Bainitic Packet in Control of Impact Toughness in a Simulated CGHAZ of X90 Pipeline Steel

Guo

Fan

Wang

et al. 2016

Metals

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X90 pipeline steel was processed with the simulated coarse grain heat affect zone (CGHAZ) thermal cycle with heat input varying from 30 kJ/cm to 60 kJ/cm, the microstructures were investigated by means of optical microscope (OM), scanning electron microscope (SEM), electron backscattering diffraction (EBSD), and transmission electron microscope (TEM), and the impact properties were evaluated from the welding thermal cycle treated samples. The results indicate that the microstructure is primarily composed of lath bainite. When decreasing the heat input, both bainite packet and block are significantly refined, and the toughness has an increased tendency due to the grain refinement. The fracture surfaces all present cleavage fracture for the samples with different heat inputs. Moreover, the average cleavage facet size for the CGHAZ is nearly equal to the average bainite packet size, and the bainitic packet boundary can strongly impede the crack propagation, indicating that the bainitic packet is the most effective unit in control of impact toughness in the simulated CGHAZ of X90 pipeline steel.

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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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Influence of peak temperature during simulation and real thermal cycles on microstructure and fracture properties of the reheated zones

Cited by 91 publications

References 21 publications

Microstructure and toughness of the CGHAZ of an offshore platform steel

Microstructure and toughness of the CGHAZ of an offshore platform steel

The Role of the Bainitic Packet in Control of Impact Toughness in a Simulated CGHAZ of X90 Pipeline Steel

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

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