25-27 April 2022
Conventum Conference Center
Europe/Vienna timezone

Fatigue damage and life prediction of AISI H13 hot die steel under the cyclic thermo-mechanical loading

26 Apr 2022, 16:50
20m
Room 2

Room 2

Oral Presentation Fatigue under mechanical & thermal cyclic loads Fatigue under Mechanical & Thermal Cyclic Loads

Speaker

Boya Wu (Shanghai University)

Description

The failure of die-casting molds is often caused by the the thermo-mechanical fatigue (TMF) damage because of oxidation-fatigue-creep complicated interactions. Due to the complexity and difficulty of TMF experiment, the description of damage and failure process of the material in the TMF process has been lacking at present. In this paper, the TMF behavior of AISI H13 steel under common die-casting-working conditions (temperature: 200-600°C, mechanical strain: 0.7% and 0.9%) is measured. It can be clearly observed in this experiment that under strain control, as the absolute value of the material stress decreases, the area of the hysteresis loop of the material first increases and then decreases during the cycle. According to the theory, the area of the hysteresis loop represents the fatigue damage of the material during the TMF process. Owing to the complexity of hysteresis loop, an approximate method is conventionally used to replace the area of the hysteresis loop by the arithmetic product of shape factor and strain energy in other studies. In order to obtain a more accurate fatigue damage process during the TMF cycle, this paper directly calculates the area of the hysteresis loop to obtain a more accurate hysteresis energy and describes the material fatigue damage during the TMF experiment (Fig. 1). Furthermore, this paper uses an accurate calculation method of hysteresis energy and combines experimental data to modify the Ostergren model. The model was successfully applied to the TMF life prediction of H13 steel with good accuracy (Fig. 2).
Cyclic hysteresis energy response curves and hysteresis loop evolution of AISI H13 hot work die steel during the IP and OP TMF tests under different mechanical strain amplitudes: (a) IP, 0.7%, (b) OP, 0.7%, (c) IP, 0.9% and (d) OP, 0.9%.
Comparison between the predicted and experimental TMF life of H13.

Speaker Country China

Primary authors

Boya Wu (Shanghai University) Pengpeng ZUO Guocai Xu (Shanghai University) Junwan Li (Shanghai University) Xiaochun Wu (Shanghai University)

Presentation Materials

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