利用機械合金法製備播散TiC強化440C不鏽鋼複合合金之研究

Processing of TiC Dispersion Strengthened 440C Stainless Steel Composite Alloy by Mechanical Alloying

李昆達(Kuen-Da Li)

指導教授 ： 徐開鴻

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2007年)

摘要

本實驗是將440C高鉻不鏽鋼粉末添加25、35、45vol%TiC粉末，利用機械合金法攪磨製成複合粉末。在攪磨轉速600rpm、磨球與粉末比例(BPR)80、溫度30℃，攪磨時間16hr下可得到良好的複合粉末，再進行油壓成型、真空燒結、熱均壓等製程得到TiC播散強化440C不鏽鋼複合合金。以XRD、SEM、雷射粒度分析儀、視孔隙率、硬度、三點抗彎強度試驗等方式來觀察分析，探討機械合金製程對製備播散強化複合合金的效果。結果顯示真空燒結的溫度越高，合金越緻密，視孔隙率越低，這結果直接影響到合金的硬度，使添加35vol%TiC，1400℃下燒結的合金有最高的硬度；而在強度方面受到燒結溫度提高導致晶粒成長的影響，以添加25vol%TiC，1200℃下燒結的合金有最佳的強度。

關鍵字

機械合金 ； 散佈強化 ； 複合材料 ； 熱均壓

並列摘要

The composite powders that 440C high chromium stainless steel with different amounts (25, 35 and 45vol.%) of TiC has been successfully produced by Mechanical alloying Method. As a result in experiment when milling speed fixed on 600rpm, BPR80 and temperature control is under 30℃, the composite powders were form within 16hr. Then the composite powders were shaping and vacuum sintered at 1200, 1300 and 1400℃, followed by HIP processes. Finally, the composite alloys were form. Various materials characterization techniques were used in order to evaluate the materials properties and microstructures, including apparent porosity, hardness test, transverse rupture strength (TRS) test, XRD and SEM. The results show that a high hardness was obtained when the 35vol.% TiC composite powder was sintered at 1400℃. a high TRS value was obtained when the 25vol.% TiC composite powder was sintered at 1200℃.

並列關鍵字

Mechanical alloying method ； dispersion strengthened ； composite Material ； HIP

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