Work

High-yttrium-content Hastelloy X fabricated by additive manufacturing: overcoming TCP phase-introduced embrittlement for enhanced creep resistance

Year: 2025

Type: article

Abstract: Contrary to conventional approach that enhanced high-temperature creep performance by adding low levels of yttrium, in this work, we innovatively added a high content of Y (0.76 wt.%) to Hastelloy X and utilized laser powder bed fusion to form uniformly dispersed nano-sized Ni5Y phases at the cell boundaries. The Y-HX alloy exhibits sixfold longer creep rupture lifetime and lower minimum creep rate compared to the HX alloy at 750°C. The Ni5Y phase promotes Cr23C6 nucleation, forming chain-like Ni5Y-Cr23C6-σ precipitates, and mitigating embrittlement at medium temperature. Dense hexagonal dislocation networks at Ni5Y/matrix interfaces facilitate stress relaxation via cross-slip, preventing interfacial cracking.

Source: Materials Research Letters

DOI: 10.1080/21663831.2025.2558096

Authors: Xiaopeng Cheng, Yanan Zhao, Weiqiang Hu, Bin Gan, Guoliang Zhu, Zongqing Ma

Institutions: Tianjin University, Shanghai Jiao Tong University, Jining Medical University

Language: English

Topic: High Temperature Alloys and Creep

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,459

Funders: National Natural Science Foundation of China, Beijing Municipal Natural Science Foundation, Tianjin Science and Technology Program