Effect of Mn Content on Microstructure and Mechanical Properties of Weld Metal During High Heat Input Welding Processes

Song, Fang; Shi, M. H.; Wang, Peng; Fang, Zhu; Misra, R.D.K.

doi:10.1007/s11665-017-2597-7

Cited by 14 publications

(9 citation statements)

References 7 publications

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“…This indicated that the distribution of inclusions had significant influences on the nucleation of AFs. 12 With increasing Ti content, the number of inclusions in the 2# weld metal was increased, increasing the probabilities of collision of the AFs and restricting the development of AF microstructure ( Figure 6). However, although the Ti content was increased in the 3# weld metal, the number of inclusions was not increased.…”

Section: Discussionmentioning

confidence: 99%

In-situ observation on the influences of Ti on phase transformation of weld metal processed by high-heat input welding

Song

Lingzhen

2014

Advances in Mechanical Engineering

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The in-situ observation of the phase transformation processes of weld metal during high-heat input welding were carried out by a high temperature laser confocal microscope. The influences of Ti content on the phase transformation process were investigated. It was found that the Ti inclusions could act as the nucleation sites for α→γ transformation during the heating stage of welding thermo cycle and inhibit the growth of austenite grains. The number of inclusions was increased with increasing Ti content. During the cooling stage of welding thermo cycle, the inclusions could induce the nucleation of acicular ferrites when the Ti content was below 0.078%. With increasing Ti content, more acicular ferrites collided with each other and restricted their further growth. When the Ti content was increased up to 0.115%, a proportion of Ti atoms were dissolved in the matrix, which increased the hardenability and thus generated the lath bainite microstructure instead of acicular ferrite.

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Section: Discussionmentioning

confidence: 99%

In-situ observation on the influences of Ti on phase transformation of weld metal processed by high-heat input welding

Song

Lingzhen

2014

Advances in Mechanical Engineering

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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%

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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“…Although the latter two inclusions do not have good lattice matching with the acicular ferrite, a Mn-depleted layer around the inclusions is explained to enhance acicular ferrite formation [18]. The volume fraction of acicular ferrite decreased with decreasing number density of inclusions with Mn depletion layers, resulting in reduction of low-temperature toughness [19].…”

Section: Introductionmentioning

confidence: 98%

Microstructure features and formation mechanism in a newly developed electroslag welding

et al. 2021

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Electroslag welding (ESW) is known to show higher heat input than electrogas welding (EGW), resulting in poor low-temperature toughness. However, a newly developed ESW (dev. ESW) method using low-resistivity slag bath exhibited excellent low-temperature toughness as a result of lower effective heat input than conventional EGW, as demonstrated by the faster cooling rates measured in weld metals and estimated using finite element method analyses. This led to much shallower molten pool in the dev. ESW, resulting in much finer columnar grains and thinner centerline axial grains. High cooling speed in the dev. ESW method appeared to contribute to increased acicular ferrite proportion. The uniform microstructure with large acicular ferrite proportion and small number of inclusions in the weld metal permitted the dev. ESW weld metal to possess little variation in Charpy impact energy across the center of weld metal.

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Effect of Mn Content on Microstructure and Mechanical Properties of Weld Metal During High Heat Input Welding Processes

Cited by 14 publications

References 7 publications

In-situ observation on the influences of Ti on phase transformation of weld metal processed by high-heat input welding

In-situ observation on the influences of Ti on phase transformation of weld metal processed by high-heat input welding

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

Microstructure features and formation mechanism in a newly developed electroslag welding

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