臺灣博碩士論文加值系統

本研究探討經熱處理、深冷處理及高速火焰熔射碳化物噴覆處理之
鎳鉻鉬鋼耐磨特性變化。JIS SNCM 220 及JIS SNCM 415 分別經滲碳到
有效硬化層深度為0.6 mm，再進行深冷處理；JIS SNCM 439 進行淬火
回火熱處理到45HRC；再分別經熔射噴覆(HVOF)到厚度約125±25μm
之WC/Co 塗層。由實驗結果得知，經HVOF 噴覆WC/Co 塗層硬度介於
1025±75HV 之間。處理試片進行荷重95.9N，轉速為180rpm 之塊材對
輥輪(Block-on-Roller)乾式磨耗試驗，其中對磨輥輪硬度有60 及42HRC
二種。由磨耗結果顯示，以 60HRC 為對磨材經12h 磨耗，滲碳SNCM 220
試片經深冷處理，磨耗損失量由滲碳未深冷之0.05g 降至0.03g，表面
WC/Co 噴覆處理後，磨耗損失量由0.03g 再降至0.002g。滲碳SNCM 415
試片經深冷處理後，由滲碳未深冷之0.05g 降至0.025g，表面WC/Co 噴
覆處理後，磨耗損失量由0.025g 再降至0.002g；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0.045g 降至0.002g，顯
示深冷處理及HVOF 處理後均能有效提升表面硬度及降低鋼材磨耗損
失。

This study was performed in order to investigate the wear behavior of
NiCrMo steel with/without sub-zero treatment and carbide coating. The JIS
SNCM 220 and JIS SNCM 415 steels were carburized and a JIS SNCM 439
steel was quenched and tempered to 45HRC. The WC/Co coating about
125μm thick was coated on surface of the three steels by the high velocity
oxy-fuel (HVOF) spray. The experimental results indicate that
microhardness of the WC /Co coating were found to be 900~1200 HV0.3. The
wear testing was conducted under 95.9N with 180 rpm at the type of
block-on-roller. From the results of 12hr wear tests, the mass loss of sub-zero
treatment SNCM 220 specimen was decreased from 0.05g to 0.03g. The
mass loss of carbide coated SNCM 220 specimen by the HVOF spraying
was decreased from 0.03g to 0.002g. The mass loss of sub-zero treatment
SNCM 415 specimen was decreased from 0.05g to 0.025g. meanwhile, the
mass loss of carbide coated SNCM 415 specimen by the HVOF spraying
was decreased from 0.025g to 0.002g. The mass loss of SNCM 439
specimen by the HVOF was decreased from 0.045g to 0.002g. Therefore, the
HVOF spraying can improve the surface hardness and wear resistance of
steel.

ABSTRACT I
中文摘要 II
目次III
圖目錄Ⅵ
表目錄XIII
第一章 前言 1
第二章 文獻回顧3
2.1 滲碳處理3
2.2 深冷處理7
2.3 高速火焰熔射(High Velocity Oxy-Fuel, HVOF)10
2.3.1 高速火焰熔射發展與原理11
2.3.2 碳化鎢塗層及高速火焰熔射塗層之應用13
2.4 磨耗機制16
第三章 實驗步驟21
3.1 試片製備21
3.2 實驗流程與參數22
3.3 試片分析26
3.3.1 微觀組織觀察26
3.3.2 微硬度試驗26
3.3.3 X-ray 繞射分析26
3.3.4 元素縱深分析27
3.4 EPMA (Electron probe microanalyzer)分析27
3.5 電化學分析28
3.6 磨耗試驗29
3.7 表面粗糙度30
3.8 SEM 型態觀察31
第四章 結果與討論32
4.1 滲碳層結構觀察32
4.1.1 滲碳層金相組織32
4.1.2 微硬度試驗40
4.1.3 X-ray 繞射分析45
4.1.4 元素縱深分析47
4.2 EPMA (Electron probe microanalyzer)分析48
4.3 電化學試驗49
4.4 磨耗試驗53
4.4.1 表面粗糙度53
4.4.2 耐磨耗性質62
4.4.3 磨痕73
第五章 結論91
參考文獻94

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