Effect of laser welding heat input on fatigue crack growth and CTOD fracture toughness of HSLA steel joints

Ribeiro, Henrique Varella; Baptista, Carlos Antônio Reis Pereira; Lima, Milton Sérgio Fernandes de; Torres, M.A.S.; Marcomini, José Benedito

doi:10.1016/j.jmrt.2021.01.038

Cited by 21 publications

(7 citation statements)

References 37 publications

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“…With respect to the mechanical performance of the HAZ, the formation of acicular ferrite is desirable over other ferrite morphologies, which is associated with the unique interlocking structure and high density of high-angle boundaries. In particular, its radially-oriented interlocking ferrite plates limit crack propagation by deflection and branching [6,7,[58][59][60][61][62][63][64][65][66]. High-angle boundaries act as a barrier to cleavage crack propagation, forcing cleavage cracks to change the microscopic plane of propagation in order to accommodate the new local crystallography [67,68].…”

Section: Mechanical Performance Of Weld Metal/haz Containing Acicular...mentioning

confidence: 99%

Critical assessment 42: Acicular ferrite formation and its influence on weld metal and heat-affected zone properties of steels

Cho

Tselikova²,

Holtgrewe

et al. 2022

Materials Science and Technology

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Toughness and fatigue resistance of welds and associated heat-affected zones (HAZs) in high-strength steels are important design parameters in structural applications. Acicular ferrite microstructures, which can be achieved through control of weld process and nucleant (inclusions or precipitates) characteristics, are often regarded as key to enhancing weld metal and HAZ properties of welded steels. This paper addresses the transformation characteristics of acicular ferrite related to alloying and weld processing as well as the specific role of acicular ferrite in weld performance, along with future research needs to identify weld processes suitable to specific alloying strategies.

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Section: Mechanical Performance Of Weld Metal/haz Containing Acicular...mentioning

confidence: 99%

Critical assessment 42: Acicular ferrite formation and its influence on weld metal and heat-affected zone properties of steels

Cho

Tselikova²,

Holtgrewe

et al. 2022

Materials Science and Technology

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“…Another factor that may influence the results was concluded by Gordon et al [33] indicating that, for HSLA steels, the heat input ends up impacting hardness, with higher and more uniform hardness observed at low heat input levels. In the studies by Ribeiro et al [34], regarding the morphologies of acicular ferrite, Widmanstätten ferrite, and grain boundary ferrite, they exhibited an average hardness of 250 HV with a standard deviation of ±10 HV. These results are consistent with the findings in the current study, both in terms of the identified microconstituents and hardness, which can also be related to the varying amounts of acicular ferrite found in the different electrodes, with this microconstituent having the highest hardness.…”

Section: Cghaz-fghaz Wm-fghaz Wm-cghazmentioning

confidence: 99%

Effect of the Filler Metal and Shielding Gas on the Fatigue Life in HSLA Steels Welded Using the GMAW Process

Briones,

Zanin,

Iquilio Abarzúa

et al. 2023

Metals

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The composition of the filler electrodes, as well as the shielding gases, has a strong impact on the static and dynamic properties of welded joints in HSLA steels. The content of Cr, Ni, and Mo, along with the shielding gases, helps maintain the hardness values in the HAZ of HSLA steels welded using the GMAW process, resulting in a positive impact on the fatigue life of the joints. Maintaining fatigue properties in the regions of the heat-affected zone is crucial. The increase in the size of the HAZ, coupled with microstructural changes, leads to a reduction in the hardness values in this region, contributing to a decrease in the fatigue life of welded joints. In this study, the effects of using different filler electrodes and shielding gases on the fatigue properties of welded joints in LNE 600 steel with a thickness of 4.75 mm, welded using the GMAW process, were evaluated. It was possible to observe a reduction in the hardness values in the HAZ region and a similar static resistance behavior for all evaluated conditions, except for the ER70S-6 electrode with 5% O2 gas, where the fatigue life showed better results with the application of the ER120S-G electrode.

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“…The addition of rare earth Ce, Pr and Y have a good regulation effect on the deposited metal of high strength steel. The loss in the toughness of deposited metal is related to not only matrix microstructure, but also the formation of inclusions [19][20][21][22][23][24][25]. AWS A5.28 E120C-K4 high strength steel flux-cored wire has excellent resistance to wind, low spatter rate and all-position welding, high tensile strength and good toughness, even at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Input on Microstructure and Mechanical Properties of Deposited Metal of E120C-K4 High Strength Steel Flux-Cored Wire

Zhang

Chen

et al. 2023

Materials

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The effect of different heat inputs of 1.45 kJ/mm, 1.78 kJ/mm and 2.31 kJ/mm on the microstructure and mechanical properties of deposited metals of the self-developed AWS A5.28 E120C-K4 high strength steel flux-cored wire was studied by optical microscope, scanning electron microscope and mechanical property test. With the increase in heat input, the results showed that the microstructure of deposited metals became coarse. Acicular ferrite increased at first and then decreased, granular bainite increased and degenerated upper bainite and martensite decreased slightly. Under the low heat input of 1.45 kJ/mm, the cooling rate was fast and the element diffusion was uneven, which caused composition segregation and easy to form large size inclusions SiO2-TiC-CeAlO3 with weak binding to the matrix. Under the middle heat input of 1.78 kJ/mm, the composite rare earth inclusions in dimples were mainly TiC-CeAlO3. The dimples were small and uniformly distributed, and the dimple fracture mainly depended on the wall-breaking connection between medium-sized dimples rather than an intermediate media. Under the high heat input of 2.31 kJ/mm, SiO2 was easy to adhere to high melting point Al2O3 oxides to form irregular composite inclusions. Such irregular inclusions do not need to absorb too much energy to form necking. Finally, the integrated effects of microstructure and inclusions resulted in the optimum mechanical properties of deposited metals with a heat input of 1.78 kJ/mm, which was a tensile strength of 793 MPa and an average impact toughness at −40 °C of 56 J.

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Effect of laser welding heat input on fatigue crack growth and CTOD fracture toughness of HSLA steel joints

Cited by 21 publications

References 37 publications

Critical assessment 42: Acicular ferrite formation and its influence on weld metal and heat-affected zone properties of steels

Critical assessment 42: Acicular ferrite formation and its influence on weld metal and heat-affected zone properties of steels

Effect of the Filler Metal and Shielding Gas on the Fatigue Life in HSLA Steels Welded Using the GMAW Process

Effect of Heat Input on Microstructure and Mechanical Properties of Deposited Metal of E120C-K4 High Strength Steel Flux-Cored Wire

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