High-Cycle Fatigue Behavior and Fatigue Strength Prediction of Differently Heat-Treated 35CrMo Steels

Author:

Yang Mengqi,Gao Chong,Pang Jianchao,Li Shouxin,Hu Dejiang,Li XiaowuORCID,Zhang Zhefeng

Abstract

In order to obtain the optimum fatigue performance, 35CrMo steel was processed by different heat treatment procedures. The microstructure, tensile properties, fatigue properties, and fatigue cracking mechanisms were compared and analyzed. The results show that fatigue strength and yield strength slowly increase at first and then rapidly decrease with the increase of tempering temperature, and both reach the maximum values at a tempering temperature of 200 °C. The yield strength affects the ratio of crack initiation site, fatigue strength coefficient, and fatigue strength exponent to a certain extent. Based on Basquin equation and fatigue crack initiation mechanism, a fatigue strength prediction method for 35CrMo steel was established.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Liaoning Province

Research on Lifetime Prediction of Non-rotating Parts of Pump Turbine Unit Based on Rotor-Stator Interaction (RSI), Fluid-Structure Coupling and Fracture Mechanics

Publisher

MDPI AG

Subject

General Materials Science,Metals and Alloys

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