Very High Cycle Fatigue Behaviors of Bainite/Martensite Multi-phase Steel and Mechanism of Non-inclusion Induced Crack Initiation
GAO Guhui1, CHEN Qianru2,3, GUO Haoran1, CHENG Cheng1, BAI Bingzhe1
1 School of Mechanical, Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044; 2 College of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065; 3 Well Cementing Compangy,CNPC Chuanqing Drilling Engineering Company Limited,Xi’an 710018
Abstract: In order to improve the fatigue properties of the steel component used in high speed railway and oil exploration, the bainite/martensite (B/M) multiphase high strength steels with excellent fatigue properties have been developed. Many results showed that the very high cycle fatigue (VHCF) property of B/M steels is less sensitive to the inclusion than that of conventional tempered martensite steels. Hence, both non-inclusion and inclusion-induced crack initiations occurred in the B/M steels under VHCF test. The microstructure morphologies, i.e., phase types, microstructure homogeneity and refinement degree,could influence the non-inclusion induced crack initiation. The VHCF crack initiation sites are determined by the competition between the inclusion level and the microstructure morphologies of the B/M steels. Enhanced VHCF properties of B/M steels have been achieved through coordinated adjustment of physical and/or chemical metallurgy treatment (e.g., microstructure optimization and inclusion size reduction). The mechanism of non-inclusion induced crack initiations is also discussed.
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2017, Vol. 31 
