Microstructure and fatigue properties of low temperature coiling hot-rolled dual phase steel

doi:10.13251/j.issn.0254-6051.2021.05.008

Abstract

Abstract: Microstructure and fatigue properties of low temperature coiling hot-rolled dual phase steel were studied by using SEM and tension-tension fatigue tests. The results show that the fatigue limit of the hot-rolled dual phase steel is approximately 530 MPa. The average size of inclusion of the hot-rolled dual phase steel produced by low temperature coiling is less than 5 μm, with small grain and tiny uniformly distributed martensite, which leads to good comprehensive mechanical propertles. The source of fatigue crack in the hot-rolled dual phase steel is located on the edge of specimen surface. There are plenty of dimples, tearing ridges, fatigue striations and secondary cracks in fatigue crack growth zone. Fatigue final rupture region mainly consists of superficial dimples. Different degree of strain occurred in ferrite and martensite finally results in the born of secondary cracks on the phase interface of ferrite and martensite. The secondary cracks are borned but don't grow. Large number of secondary cracks disperse the stress concentration at the tip of main cracks, which can effectively reduce the driving force of crack growth, slow down the fatigue crack propagation rate, and restrain fatigue crack propagation and finally improve the fatigue properties.

Key words: dual phase steel, low temperature coiling, microstructure, fatigue properties, EBSD

CLC Number:

TG156

Zhao Nan, Liu Xuewei, Sun Mingjun, Xue Jun. Microstructure and fatigue properties of low temperature coiling hot-rolled dual phase steel[J]. Heat Treatment of Metals, 2021, 46(5): 55-59.

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