A Comparison of the Plastic-Flow Response of a Powder-Metallurgy Nickel-Base Superalloy Under Nominally-Isothermal and Transient-Heating Hot-Working Conditions

Semiatin, S. L.; Mahaffey, D. W.; Tung, Daniel Joseph; Zhang, Wei; Senkov, O.N.

doi:10.1007/s11661-016-3907-7

Cited by 8 publications

(1 citation statement)

References 27 publications

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“…The values for Young's modulus and yield strength followed expected trends in the solid phase with increasing temperatures. Perfect plasticity without work hardening was assumed and considered to be reasonable since hardening at high temperatures is limited due to rapid dislocation motion [27]. Although neglecting the work hardening effect might underestimate the stress levels, the tension to compression transition point is more critical in capturing the cracking locations than the absolute stress values away from the weld pool.…”

Section: Methodsmentioning

confidence: 99%

Integrated modeling of cracking during deep penetration laser welding of nickel alloys

Gao

Mondal

Palmer

et al. 2023

Science and Technology of Welding and Joining

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During deep penetration laser welding of nickel alloys, interactions between composition and processing conditions can lead to the formation of defects. Inconel 740H, for example, has demonstrated a susceptibility to horizontal fusion zone cracking at locations between 70% and 80% of the weld depth during laser welding at powers above 5 kW. Coupling three-dimensional heat transfer, fluid flow, and stress modeling tools allowed that both the strain rate and stress normal to the solidification direction to be calculated. In the Inconel 740H welds, cracks formed at locations where the strain rate and stress simultaneously reached critical levels. No cracking was observed in the Inconel 690 welds, since the strain rate and stress did not simultaneously reach these critical levels.

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Section: Methodsmentioning

confidence: 99%