Effect of inclusions on fatigue life of engineering machinery structural steel Q345FCA

doi:10.13251/j.issn.0254-6051.2020.08.002

Abstract

Abstract: Fatigue life of the high fatigue life Q345FCA steel for engineering machinery was determined by using QBWP-6000J rotary bending fatigue testing machine for simply supported beams. The fatigue fracture morphology was observed by scanning electron microscope (SEM) and the inclusions on fracture surface were searched by energy dispersive spectrometer (EDS). The inclusions were analyzed by inclusion automatic analysis system, and the critical size of inclusions was calculated through experimental data analysis. The results show that the fatigue strength of Q345FCA steel and Q345 steels is 273 MPa and 266 MPa, respectively. The size of the inclusions in the Q345FCA steel and Q345 steel is all small, which is smaller than the critical size of the inclusions, and the fracture morphologies show that all the fatigue fractures are not caused by inclusions, which are not the source of fatigue.

Key words: engineering machinery structural steel Q345FCA, fatigue life, inclusions, critical size

CLC Number:

TG142.41

Li Mingyang, Wang Fuming, Li Ming, Gong Shuo. Effect of inclusions on fatigue life of engineering machinery structural steel Q345FCA[J]. Heat Treatment of Metals, 2020, 45(8): 7-11.

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