首页|(105854)The relationship between fracture toughness and tensile property in high-strength steels
(105854)The relationship between fracture toughness and tensile property in high-strength steels
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NSTL
Elsevier
In the present work, the fracture toughness and tensile property of 40CrNiMoA high-strength steel were systematically investigated, The experimental results reveal that the ultimate tensile strength of 40CrNiMoA steel decreases gradually with improving the tempering temperature, while the fracture toughness reveals a reverse trend to the tensile strength. The fractography shows the consistency of quasi-static fracture characteristic in the tensile and K_(IC) specimens. The complicated fracture mechanism of 40CrNiMoA steel is mainly attributed to the various micro-structures: grain size, dislocation density and precipitated carbides. Additionally, based on the macro/micro- fracture mechanisms and energy principle, we proposed the relation between fracture toughness and macroscopic tensile parameters. The new model would provide an effective strategy to predict the fracture toughness of high-strength steels, which can be further applied to other engineering materials such as aluminum and titanium alloys.
State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
NSTL
Elsevier
