Influence of heat input on hot cracking sensitivity of the EA395-9 filler metal

Yang, Xingwang; Liu, Fu-Guang; Shi, Chunfeng; Liu, Gang; Li, Yong

doi:10.1515/mt-2022-0244

Cited by 1 publication

(2 citation statements)

References 26 publications

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“…However, higher heat input, pulse frequency and thermal pulse frequency imparted a negative effect on the volume fractions of AF. Yang [13] demonstrated that the moderate welding heat input can help to avoid hot cracking. In addition, Dong [14] found that increasing the welding heat input could suppress the formation of martensite (M) and reduce the microhardness of heat affected zone (HAZ).…”

Section: Introductionmentioning

confidence: 99%

“…Most research mainly focuses on the effect of the heat input and microstructure on the impact toughness of deposited metal. However, the presence of inclusion is generally thought to be a major factor that deteriorates the toughness of deposited metal [8][9][10][11][12][13][14][15][16][17][18]. Especially when the inclusion is modified by rare earth elements, because rare earth elements are sensitive to the change of welding thermal cycle temperature, the change of heat input will affect the reaction and existing state of rare earth elements and other alloy elements.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%