Study on Creep-Fatigue Mechanical Behavior and Life Prediction of Ti2AlNb-Based Alloy

Yanju Wang; Xinhao Wang; Yanfeng Yang; Xiang Lan; Zhao Zhang; Heng Li

doi:10.3390/ma15186238

Study on Creep-Fatigue Mechanical Behavior and Life Prediction of Ti₂AlNb-Based Alloy

Materials (Basel). 2022 Sep 8;15(18):6238. doi: 10.3390/ma15186238.

Authors

Yanju Wang¹, Xinhao Wang², Yanfeng Yang², Xiang Lan¹, Zhao Zhang², Heng Li²

Affiliations

¹ Materials Evaluation Center for Aeronautical and Aeroengine Application, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China.
² State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China.

Abstract

Low-cycle fatigue, creep and creep-fatigue tests of Ti₂AlNb-based alloy were carried out at 550 °C. Compared with low-cycle fatigue, a creep-fatigue hysteresis loop has larger area and smaller average stress. The introduction of creep damage will greatly reduce the cycle life, and change the fatigue crack initiation point and failure mechanism. Based on the linear damage accumulation rule, the fatigue damage and creep damage were described by the life fraction method and the time fraction method, respectively, and the creep-fatigue life of the Ti₂AlNb-based alloy is predicted within an error band of ±2 times.

Keywords: Ti2AlNb-based alloy; creep-fatigue; fracture mechanism; life prediction.

Abstract

Grants and funding