Study on Fatigue Fracture Mechanism of High Strength TRIP600 Steel for Automobile
Li, Yongli
Tang, Xiuli
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How to Cite

Li Y., Tang X., 2017, Study on Fatigue Fracture Mechanism of High Strength TRIP600 Steel for Automobile , Chemical Engineering Transactions, 62, 661-666.
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Abstract

The purpose of this paper was to carry out a series of fatigue tests on a 1.5 mm thick TRIP600MP steel plate. The test data were fitted and the fatigue behaviour was observed by a scanning electron microscope. The test results showed that the fatigue limit of TRIP600 steel plate was 460 MPa under a condition of high cyclic tensile fatigue test with a load frequency of 8 Hz and R=0. The empirical formula of SN curve fitting was lgN=51.1625-16.8574lgσ. The result revealed that the fatigue source of steel plate was mostly under the surface. The principal conclusions were that the extension of the crack was a ductile fracture and the fault zone was brittle fracture.
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