Adiabatic shear banding behavior of additively manufactured superalloy in 625
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Bhavsar, Pavan; Lopez-Hawa, Homar; Ananda-Kumar, Rajesh; Madhavan, Viswanathan; Moscoso-Kingsley, Wilfredo. 2019. Adiabatic shear banding behavior of additively manufactured superalloy in 625. Procedia Manufacturing, vol. 34:pp 722-730
Additively manufactured nickel superalloy (IN 625) has gained popularity as an alternative to produce high value products of complex geometries for high strength applications under high temperature and corrosive environments. Many of these applications also demand the alloy to withstand high strain rate plastic deformation before the onset of catastrophic failure. The alloy's utility for high strain rate applications would be compromised if it were to fail suddenly by mechanisms such as adiabatic shear localization. This paper evaluates the shear localization behavior of an additively manufactured IN 625, and compares it to the behavior of the material of equal nominal composition, but prepared by traditional cast-wrought processing. The evaluation was made by imposing pure shear at strain rates of the order of 10,000 1/s in a simple machining configuration. It was found that the additive alloy experienced adiabatic shear banding more readily than the cast-wrought counterpart did. This finding contradicted predictions based on constitutive models developed for both alloys from split-Hopkinson compression testing, which indicated that the additive alloy strain hardened more than the cast-wrought counterpart did.
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