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題名 | 鈦硼元素添加對銲道機械性質之效應探討=Effect of Ti and Boron Addition on the Mechanical Properties of Welds |
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作者姓名(中文) | 謝榮淵; 林鴻榮; | 書刊名 | 銲接與切割 |
卷期 | 9:6 1999.11[民88.11] |
頁次 | 頁46-57 |
分類號 | 472.14 |
關鍵詞 | 鈦; 硼; 銲道; 機械性質; |
語文 | 中文(Chinese) |
中文摘要 | 本研究之目的在於探討 Ti、B 元素添加對銲道機械性質之影響。首先以雙極潛弧 銲接法進行多道銲接,銲接入熱量分別為 60KJ/cm 和 80KJ/ cm;選用二種 Ti-B 基銲線及 鹼性和酸性銲藥各一種。銲接試片進行拉伸及衝擊試驗以評估銲道之機械性質;此外,也利 用 OM、SEM 和 TEM 以分析銲道之顯微組織。結果顯示,Ti-B 銲線搭配鹼性銲藥時,Ti 含 量在 120ppm 銲道可得到最佳之韌性。 過高的 Ti 含量會因 TiC 化合物的析出,使韌性反 而降低。 此外,B 提高硬化能之效果隨 Ti 含量的增加而提高,使銲後原態銲道強度隨 Ti 含量之增加而提高。 經 600 ℃熱處理後, 會因差排重組及 Fe �� C 的球化使強度降低。 Ti-B 銲線搭配酸性銲藥時,由於銲道氧含量高, B 容易因氧化而消耗, Ti 含量必須高達 250ppm ,對韌性提昇之效果才會比較明顯。 另外,銲道直銲態強度隨 Ti 含量之增加呈現 先降後升的現象。其原因是在低 Ti 含量時,B 容易被氧化,使硬化能降低而造成強度的降 低。然而,當進一步提高 Ti 含量時,B 提昇硬化能之效應增加,強度再度上升。 |
英文摘要 | The purpose of this study is to evaluate the Ti and B elements on the effect of mechanical properties of weld metal. Two kinds of Ti-B base wire were used. The multipasses welding were performed with tandemsubmerged arc welding; the heat input was 60 and 80KJ /cm, respectively. On the other hand, the acid and basic flux was used. The tensile and charpy tests were carried out to evaluate the mechanical properties of weld metal. In addition, the microstructure of weld metal was examined using OM, SEM, and TEM. The results show that the toughness of weld metal reach maximum at 120ppm Ti content when basic flux is used with low oxygen content, in which the hardenability improved by B may fully develop. However, the toughness of weld metal decreases when Ti content is over 120ppm due to the precipitation of TiC particles. The strength of weld metal increases with increasing Ti content in as-welded condition. After 600 ℃ heat treatment, the strength decreases due to the rearrangement of dislocation and spheroidization of Fe �� C carbide. However, the Ti content in weld metal must be as high as 250ppm for improving the toughness of weld metal when acid flux is used with high oxygen content, in which the hardenability improved by B will decrease due to oxidation. The strength of weld metal in as-welded condition decreases first and then increases again with increasing Ti content. This is because B is oxidized easily at low Ti content, and loses the effect of improving hardenability. However, the strength increases again at high Ti content because the hardenability improved by B can be well developed. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。