Work

Multiaxial Creep Rupture Life Evaluation for Austenitic Stainless Steels Using Weld‐Type Miniature Cruciform Specimen

Year: 2026

Type: article

Abstract: ABSTRACT A multiaxial creep testing technique using a weld‐type miniature cruciform specimen was developed to evaluate the creep properties and rupture life of Super 304H austenitic stainless steel at 973 K (700°C). The cruciform specimen was designed to achieve a plane stress state and overcome material dimensional limitations. In situ observations revealed no significant intergranular cracking on the specimen surface up to a life ratio of 0.9, regardless of the stress condition. Creep curves obtained using the nominal strain calculated by a non‐contact measuring method showed no clear transition region and exhibited ductile rupture with an accelerated strain increase from a life ratio of 0.6. The Mises equivalent stress parameter effectively evaluated the multiaxial creep rupture life within a factor of 2 compared with the uniaxial data. These findings contribute to the understanding of the multiaxial creep behavior and life evaluation of Super 304H, which is an important material for high‐temperature applications.

Source: Fatigue & Fracture of Engineering Materials & Structures

DOI: 10.1111/ffe.70179

Authors: Noritake Hiyoshi, Shengde Zhang

Institutions: University of Fukui, Central Research Institute of Electric Power Industry

Language: English

Topic: High Temperature Alloys and Creep

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,860

Funder: Japan Society for the Promotion of Science