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題名 | 高溫淬火前持溫時間對ADI微觀組織及表面硬度之影響=Effects of Holding Time on Microstructure and Case Hardness of ADI before Quenching |
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作者 | 許正勳; 洪鈞泰; 劉洪才; Hsu, C. H.; Hung, C. T.; Liu, H. T.; |
期刊 | 鑄造工程學刊 |
出版日期 | 20141200 |
卷期 | 40:4=163 2014.12[民103.12] |
頁次 | 頁25-30 |
分類號 | 472.3 |
語文 | chi |
關鍵詞 | 沃斯回火延性鑄鐵; 淬火; 微觀組織; 硬度; 耐磨耗性; Austempered ductile iron; Quenching; Microstructure; Hardness; Wear resistance; |
中文摘要 | 本研究主要是將沃斯回火延性鑄鐵(ADI)試片先置入900℃高溫爐分別持溫1、2、4及6min,再進行淬火(Water quenching)處理,然後探討淬火前不同的持溫時間對試片微觀組織、表面硬度及耐磨耗性之影響。實驗結果顯示:由於高溫淬火效應,ADI表層組織會變態成麻田散鐵相,使得ADI表面硬度明顯地提高(450→950HV_(0.1)),而且隨著持溫時間的增加,硬化層深度亦增加;然而必須注意的是,當持溫時間為2-min時,ADI內部組織與麻田散鐵相之混合區域會產生微裂縫,甚至於當持溫時間超過4-min以上時,則微裂縫會貫穿至表面;反之,若持溫時間控制得宜(~1min),則ADI內部組織不但不會產生微裂縫,而且因表面硬度的提高使耐磨耗性獲得改善。 |
英文摘要 | In this study, the ADI specimens were first heated at 900 °C for 1, 2, 4, and 6 minutes, respectively, and then quenched in water. The purpose is to explore the effect of holding time on microstructure, surface hardness, and wear resistance of ADI. The results show that there is a martensitic formation on the surface of ADI due to the quenching effect, resulting in an evident increase of hardness on the ADI's surface (450→950 HV_(0.1)). Moreover, the depth of case hardening increased with increasing holding time. However, it must be noticed that when holding time is 2 minutes, some micro-cracks take place on the internal structure of ADI with a mixture of ausferrite and martensite. When the holding time is over 4 minutes, the cracking could penetrate the surface. In contrast, the holding time controlled (~1 min) properly could not only avoid the generation of cracks, but also increase surface hardness of ADI to improve the wear resistance. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。