Wear behavior of bainite ductile cast iron under impact load
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第9期
论文作者：Ting Sun Ren-bo Song Fu-qiang Yang Chun-jing Wu
文章页码：871 - 877
摘 要：The dry impact wear behavior of bainite ductile cast iron was evaluated under three different impact loads for 30000 cycles. The strain-hardening effects beneath the contact surfaces were analyzed according to the surfaces’ micro-hardness profiles. Scanning electron microscopy（SEM） and X-ray diffraction（XRD） were used to observe the worn surfaces. The results indicated that the material with the highest hardness was the one continuously cooled at 20°C, which exhibited the lowest wear rate under each set of test conditions. The hardness of the worn surface and the thickness of the hardened layer increased with the increases in impact load and in the number of test cycles. The better wear performance of the sample cooled at 20°C is attributed to its finer microstructure and superior mechanical properties. All the samples underwent the transformation induced plasticity（TRIP） phenomenon after impact wear, as revealed by the fact that small amounts of retained austenite were detected by XRD.
Ting Sun，Ren-bo Song，Fu-qiang Yang，Chun-jing Wu
School of Materials Science and Engineering, University of Science and Technology Beijing
摘 要：The dry impact wear behavior of bainite ductile cast iron was evaluated under three different impact loads for 30000 cycles. The strain-hardening effects beneath the contact surfaces were analyzed according to the surfaces’ micro-hardness profiles. Scanning electron microscopy（SEM） and X-ray diffraction（XRD） were used to observe the worn surfaces. The results indicated that the material with the highest hardness was the one continuously cooled at 20°C, which exhibited the lowest wear rate under each set of test conditions. The hardness of the worn surface and the thickness of the hardened layer increased with the increases in impact load and in the number of test cycles. The better wear performance of the sample cooled at 20°C is attributed to its finer microstructure and superior mechanical properties. All the samples underwent the transformation induced plasticity（TRIP） phenomenon after impact wear, as revealed by the fact that small amounts of retained austenite were detected by XRD.
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