Study on Fatigue Crack Propagation of 60Si2Mn Spring Steel

Author of the article:HUANG Jun, WU Zeng, ZHANG Rongmao, MA Wei

Author's Workplace：Faculty of Civil Engineering, Kunming University of Science and Technology, Kunming 650500, China

Key Words：heat treatment; 60Si2Mn; seven-point increasing polynominal method; secant method; Smith method; fatigue crack propagation

Abstract：The secant method and increasing polynomial method are used to deal with the fatigue crack growth rate. In this paper, the change law of fatigue crack growth rate of 60Si2Mn spring steel before and after heat treatment was studied by comparing Smith method with secant method and seven-point increasing polynomial method recommended by national standard. The results show that the seven-point increasing polynomial method can better reflect the fatigue crack growth rate of materials. After heat treatment, the fatigue crack growth curve of 60Si2Mn spring steel is more gentle, and the anti-fatigue crack growth performance is obviously improved.