Effects of load mode on mechanical properties of ZrO2(2Y)/TRIP steel composites
(1. School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China;
2. School of Materials Science and Engineering,
Harbin University of Science and Technology, Harbin 150040, China)
Harbin Institute of Technology, Harbin 150001, China;
2. School of Materials Science and Engineering,
Harbin University of Science and Technology, Harbin 150040, China)
Abstract: The ZrO2 (2Y)/TRIP steel composites were prepared by vacuum hot-pressing sintering. The room temperature static tensile and dynamic yield strength were tested using the static tensile and Split Hopkinson Pressure Bar methods, respectively. The effects of load mode on the static and dynamic mechanical behaviors were studied. The results show that the static tensile strengths of the composites decrease with the increase of ZrO2 content, for the weak bonding of ZrO2/ZrO2. Under the dynamic load, the matrix TRIP steel produces the martinsitic phase transformation, which improves the dynamic strength and deformation ability of the composites. When the volume fraction of ZrO2 exceeds 20%, the strain-hardening coefficient and the dynamic deformation ability of the composites decrease.
Key words: ZrO2 (2Y)/TRIP steel composite; static strength; dynamic strength; martinsitic phase transformation