Work

High-cycle tensile-tensile fatigue performance of niobium alloy: Conventional vs wire-arc additive manufacturing

Year: 2024

Type: article

Abstract: This study explores the high-cycle fatigue (HCF) behavior of a niobium alloy, NbZr1, fabricated using wire-arc additive manufacturing (WAAM), and compares its fatigue strength to that of its powder metallurgy (PM)-produced counterpart. The analysis was conducted at three different stress levels, each characterized by a non-zero mean stress and a stress ratio of 0.1. The fatigue life under tensile-tensile fatigue loading ranged from 10 4 to 10 8 cycles for all tested samples. WAAM-produced NbZr1 exhibited a shorter average fatigue life compared to PM-NbZr1. Examination of the fracture surfaces revealed consistent fracture morphology across all loading conditions in PM-NbZr1 samples, whereas WAAM-NbZr1 samples showed varied fracture behavior. Notably, the crack propagation regions in WAAM-NbZr1 exhibited contrasting behaviors under different loading conditions. While PM-NbZr1 demonstrated typical ductile failure with elongated dimples near the final fracture region, WAAM-NbZr1 showed more pronounced cleavage crack growth, accompanied by void nucleation and coalescence along the ZrO 2 particles during fatigue crack propagation. The interdendritic regions containing fine ZrO 2 particles were identified as a key factor influencing crack propagation and final fracture location in WAAM-NbZr1.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2024.12.254

Authors: Gazi Tanvir, Md Abdul Karim, Namjung Kim, Yongho Jeon, Duck Bong Kim

Institutions: Tennessee Technological University, Gachon University, Ajou University

Language: English

Topic: Fatigue and fracture mechanics

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $1,430