深冷及碳化物噴覆處理對滲碳鋼耐磨行為之影響

Effect of Sub-zero Treatment and Carbide Spray Coating on the Wear Behaviour of Carburized Steel

陳伯榕(Bo-Rong Chen)

指導教授 ： 邱六合

大同大學/工程學院/材料工程學系所/碩士(2010年)

摘要

本研究探討熱處理、深冷、超深冷及高速火焰熔射碳化物噴覆處理對鎳鉻鉬鋼耐磨特性影響。JIS SNCM 220滲碳至有效硬化層深度0.5mm再進行深冷及超深冷處理；JIS SNCM 439淬火回火熱處理至43HRC，再分別經熔射噴覆(HVOF)到厚度約15±5μm之WC/Co塗層。由實驗結果得知，經HVOF噴覆WC/Co塗層硬度為1209HV。處理試片進行荷重95.9N，轉速為180rpm之塊材對滾輪(Block-on-Roller)乾式磨耗試驗，其中對磨滾輪硬度有60及42HRC兩種。由磨耗結果顯示，以60HRC為對磨滾輪經12小時磨耗，滲碳SNCM 220試片經深冷處理後，磨耗損失量由滲碳未深冷之0.037g降至0.015g，經超深冷處理試片由0.037g降至0.02g，表面WC/Co噴覆處理後，由0.037g降至0.004g。淬火回火熱處理SNCM 439試片經WC/Co噴覆處理後，磨耗損失量由未噴覆之0.107g降至0.003g。顯示深冷、超深冷處理及HVOF處理後均能有效提升鋼材耐磨耗性。

關鍵字

超深冷 ； 深冷 ； 滲碳鋼 ； 碳化物噴覆塗層 ； 磨耗

並列摘要

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.

並列關鍵字

Cryogenic ； Sub-zero ； Carburized steel ； Carbide spray coating ； Wear

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