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題 名 | 合金元素Ni之少量添加對於片狀石墨鑄鐵鑄件之機械性質與表面粗糙度之影響=Effect of Alloying Element Ni Small Quantity Addition on the Mechanical Properties and Surface Roughness of Flake Graphite Cast Iron |
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作 者 | 楊榮顯; 詹子賢; 沈琦智; 沈琦智; | 書刊名 | 鑄造工程學刊 |
卷 期 | 41:1=164 2015.03[民104.03] |
頁 次 | 頁27-36 |
分類號 | 472.7 |
關鍵詞 | 合金元素鎳; 片狀石墨鑄鐵; 表面粗糙度; 機械性質; Alloying of element Ni; Flake graphite cast iron; Surface roughness; Mechanical properties; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究即在探討添加合金元素Ni(0.0~3.0wt%)時,對於片狀石墨鑄鐵鑄件不同厚度部位(20mm、40mm及80 mm)之機械性質(抗拉強度、伸長率及衝擊值)與表面粗糙度之影響。實驗結果顯示,在機械性質方面,對於各不同厚度部位之鑄件而言,隨著合金元素Ni添加量之增加,抗拉強度會隨之提高,但伸長率及衝擊值則隨之下降。對鑄件整體而言,合金元素Ni之添加量分別為0.0wt%及3.0wt%時,抗拉強度則由206.07MPa增加為214.97MPa、伸長率則由2.73%減少到2.39%,衝擊值則由1.142 J/cm^2下降至1.046 J/cm^2。在固定之機械加工條件下,鑄件加工後之表面粗糙度,隨著合金元素Ni添加量的增加,鑄件整體與各不同厚度部位之表面粗糙度皆有明顯改善。以鑄件整體而言,在合金元素Ni之添加量分別為0.0 wt% 及3.0 wt%時,其平均表面粗糙度標準差則由0.091減少到0.041。不同厚度部位鑄件(20mm、40mm及80mm)之平均表面粗糙度標準差則從0.079、0.099及0.106減少為0.033、0.036及0.033。由此可知,鑄件厚度愈厚時,合金元素Ni之添加對於加工後之表面粗糙度之改善效果愈明顯。將本研究所獲得之各項機械性質及表面粗糙度之實驗結果,對照金相顯微組織解析所呈現之隨著合金元素Ni之添加會使基地組織(波來鐵、肥粒鐵及石墨)之面積率則隨著改變之結果,即可獲得合理解釋及相互印證。 |
英文摘要 | The purpose of this study is to investigate the effect of adding alloying element Ni(0.0 to 3.0 wt.%) on the mechanical properties(tensile strength, percentage of elongation, impact value) and surface roughness of flake graphite cast iron castings with 80, 40, 20 mm thickness. The result of experiment show that in the mechanical properties, the tensile strength increased by increasing the addition amount of alloying element Ni, but the percentage of elongation and impact value decreased comparatively. Overall, the amount of alloying element Ni is added from 0.0 to 3.0 wt.%, the tensile strength increases from 206.1 MPa to 215.1 MPa, the percentage of elongation decreases from 2.73% to 2.39%, and the impact value decreases from 1.423 J/cm^2 to 1.046 J/cm^2. Under fixed machining condition, the surface roughness of the machined casting for the whole casting and different thickness portions are improved distinctly, by increasing the amount of alloying element Ni. For the whole casting, the average surface roughness standard deviation decreases from 0.091 to 0.041, for the adding amount of Ni increased from 0.0 wt.% to 3.0 wt.%. For the casting in different thickness 20 mm, 40 mm, 80 mm, the average surface roughness standard deviation decrease from 0.079, 0.099, 0.106, to 0.033, 0.036, 0.033. In the other word, for thicker casting, the effect of adding alloying element Ni on the improvement of the surface roughness for the machined casting is more obviously. Compare the experimental result of the various mechanical properties and surface roughness from this study, to the metallographic microstructure analysis result of area percentage of matrix (pearlite, ferrite, graphite) that changed with the addition of alloying element Ni, reasonable explanation and reciprocal proof could be obtained. |
本系統中英文摘要資訊取自各篇刊載內容。