Work

Microstructural mechanisms governing hot ductility recovery in VDM Alloy 780 superalloy: Competing effects of grain-boundary boron segregation and grain size

Year: 2026

Type: article

Abstract: The hot ductility recovery of the recently developed VDM Alloy 780 superalloy was systematically investigated under solution-annealing (SA) conditions at 1050–1150 °C using Gleeble thermomechanical simulations to evaluate the effects of grain-boundary (GB) boron segregation and grain size on the alloy's susceptibility to hot cracking. Nanoscale secondary ion-mass spectrometry (NanoSIMS) analysis reveals a higher level of GB segregation of boron after lower-temperature SA, suggesting that the level of boron segregation is primarily governed by equilibrium segregation. Although increasing the final SA temperature from 1050°C to 1150°C results in approximately a twofold increase in grain size, the concurrent reduction in equilibrium boron segregation at higher SA temperatures partially counteracts the detrimental effect of grain coarsening, leading to only minimal degradation of hot ductility recovery. These findings demonstrate that SA temperature influences hot ductility recovery through competing effects of grain size and GB boron segregation, providing guidance for optimizing SA strategies to mitigate hot cracking in VDM Alloy 780.

Source: Journal of Alloys and Compounds

DOI: 10.1016/j.jallcom.2026.187706

Authors: Achmad Ariaseta, Fabian Hanning, Joel Andersson, Olanrewaju Ojo

Institutions: University West, Bandung Institute of Technology, University of Manitoba

Language: English

Topic: High Temperature Alloys and Creep

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,660

Funder: VINNOVA