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URN etd-0727110-181517 Statistics This thesis had been viewed 3449 times. Download 2768 times. Author Bo-Rong Chen Author's Email Address No Public. Department Materials Engineering Year 2009 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 95 Title Effect of Sub-zero Treatment and Carbide Spray Coating on the Wear Behaviour of Carburized Steel Keyword Wear Carbide spray coating Carburized steel Sub-zero Cryogenic Cryogenic Sub-zero Carburized steel Carbide spray coating Wear Abstract This study was performed in order to investigate the wear behavior of NiCrMo steel with/without sub-zero, cryogenic treatment and carbide coating. The JIS SNCM 220 steel was carburized and a JIS SNCM 439 steel was quenched and tempered to 43HRC. The WC/Co layer having a thickness of 15μm was coated on surface of the two steels by the high velocity oxy-fuel (HVOF) spray. The experimental results indicate that microhardness of the WC/Co coating were found to be 1209HV. The wear testing was conducted under 95.9N with 180 rpm at a block-on-roller tester. From the results of 12hr wear tests, the mass loss of sub-zero treatment SNCM 220 specimen was decreased from 0.037g to 0.015g. The mass loss of cryogenic treatment SNCM 220 specimen was decreased from 0.037g to 0.02g. Meanwhile, the mass loss of carbide coated SNCM 220 specimen by the HVOF spraying was decreased from 0.037g to 0.004g. The mass loss of SNCM 439 specimen by the HVOF was decreased from 0.107g to 0.003g. Therefore, the sub-zero, cryogenic treatment and HVOF spraying can improve the wear resistance of steel. Advisor Committee Liu-Ho Chiu - advisor
Files Date of Defense 2010-07-21 Date of Submission 2010-07-28