Effect of Ti content and martensite–austenite constituents on microstructure and mechanical property

Han, Chaoyu; Li, Kejian; Liu, Xia; Cao, Rui; Cai, Zhipeng

doi:10.1080/13621718.2017.1404694

Cited by 14 publications

(10 citation statements)

References 29 publications

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“…The M-A constituent content was low for the CGHAZ, resulting in the large CVN value. The FGHAZ had a decreased fraction of brittle BF and increased fraction of ferrite (quasi-ferrite and AF) with excellent impact toughness [31,32]. Therefore, its CVN energy increased dramatically and Vickers hardness decreased by more than 20 Hv with an increasing ferrite fraction despite the FGHAZ having a large fraction of massive M-A.…”

Section: Microstructural Behaviour For Various Hazsmentioning

confidence: 96%

Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds

Kim

Nam

Lee

et al. 2018

Metals

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Abstract:The effect of martensite-austenite (M-A) constituents and simulated microstructure on low-temperature toughness was investigated in YS 500 MPa grade structural steel welds. The specimens were fabricated using a direct quenching and tempering process. After simulated weld thermal cycles, the coarse-grained heat-affected zone (CGHAZ) and intercritically reheated coarse-grained heat-affected zone (IRCGHAZ) were produced using a Gleeble tester and real welded joint to support the simulation results. The largest low-temperature toughness was observed in the fine-grained heat-affected zone (FGHAZ) owing to the fine-ferrite microstructure. However, the toughness decreased in the IRCGHAZ because of the slender morphology of the M-A constituents that formed primarily along the prior austenite grain boundaries in the IRCGHAZ.

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Section: Microstructural Behaviour For Various Hazsmentioning

confidence: 96%

Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds

Kim

Nam

Lee

et al. 2018

Metals

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“…The different parts of the HAZ arise due to differences in the peak temperature and cooling rate. [19][20][21] The CGHAZ and FGHAZ reach high peak temperatures over Ac3, taking the material into the fully austenitic phase field. The CGHAZ has the greatest peak temperature and stays above Ac3 for the longest, increasing grain size.…”

Section: Microstructurementioning

confidence: 99%

Characterization of weld joints produced by continuous wave and double pulse gas metal arc welding in naval grade high-strength low-alloy steel

Venkateshkannan

Natarajan

Rao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The current research examines gas metal arc welding (GMAW) joints generated in naval grade high-strength low-alloy (HSLA) steel using both continuous wave GMAW (CW-GMAW) and double pulse GMAW (DP-GMAW). The joint was created in four passes with DP-GMAW, whereas CW-GMAW required eight passes. Weld joints were characterized using various techniques, including optical microscopy (OM), scanning electron microscopy (SEM), residual stress analysis, and mechanical evaluation. The mechanical evaluation consisted of microhardness, impact, and tensile tests. The Charpy V-notch (CVN) impact test was performed at room temperature and −60°C. For both CW-GMAW and DP-GMAW, the heat-affected zone and the fusion zone were harder than the base metal. The fracture occurred in the base metal region in all the tensile test specimens containing the weld joints. The DP-GMAW joints showed higher impact toughness at both room temperature and −60°C. In comparison to the fusion zone of the CW-GMAW joint, the fusion zone of the DP-GMAW joint had a greater volume fraction of acicular ferrite, a finer grain size, and a higher percentage of high-angle grain boundaries. These factors have contributed, it is believed, to the higher impact toughness of the DP-GMAW joint.

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“…In this work, all these factors, dilution, filler metal, and the shielding gas, had influence on the properties of weld metal, due to their effect on the chemical composition and microstructure. Indeed, while the increase in carbon content as consequence of higher dilution is a contributing factor for obtaining low impact toughness [40,57], the addition of titanium [35,[57][58][59][60][61][62][63][64] promoted the formation of small inclusions ( Fig. 13) and refined the microstructure (Fig.…”

Section: Mechanical and Microstructural Properties Of The Welded Jointmentioning

confidence: 99%

“…Finally, a significant influence of the MA constituents (Fig. 14) on the mechanical properties is not expected, because they are not necklacing the grain boundaries [48,58,59,66].…”

Section: Mechanical and Microstructural Properties Of The Welded Jointmentioning

confidence: 99%

Influence of rotation frequency and rotation diameter on mechanical properties and microstructure of weld metal produced by MCAW-RE

Silveira

Filho

Costa

et al. 2020

Int J Adv Manuf Technol

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The MCAW process with rotating electrode (MCAW-RE) is a variation of the conventional gas metal arc welding process, which a metal-cored wire is submitted to a rotational movement along a pre-established diameter. This process enhances narrow gap welding, since the rotational motion of the electrode allows the electric arc to reach peripheral regions of the groove, preventing lack of fusion on the sidewall. As a result, reduced costs and superior productivity compared with the conventional GMAW process are obtained. The limited literature about this process is focused on the operational characteristics, and works studying the mechanical properties are not available. Thus, this work evaluates the mechanical and microstructural properties of weld metals obtained by the MCAW-RE process in order to allow a decision about its technical feasibility to replace the GMAW process in industry. Initially, beads on plate weld tests were performed with varying rotation frequency and rotation diameter, in order to determine the parameters to be used in welded joints. High-strength steel weld metals were obtained by welding performed in steel plates with dimensions of 500 × 300 × 10 mm. Mechanical tests and metallographic examination were carried out in samples removed transversally to the weld bead. The results showed that the impact toughness of the weld metals can achieve the requirements for several industrial applications. The results showed that the GMAW process with rotating electrode-cored wire has a high potential for replacement of the GMAW in industrial applications.

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Effect of Ti content and martensite–austenite constituents on microstructure and mechanical property

Cited by 14 publications

References 29 publications

Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds

Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds

Characterization of weld joints produced by continuous wave and double pulse gas metal arc welding in naval grade high-strength low-alloy steel

Influence of rotation frequency and rotation diameter on mechanical properties and microstructure of weld metal produced by MCAW-RE

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