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題 名 | 手工電銲TMCP鋼銲件之低溫機械性質=Low Temperature Mechanical Properties of TMCP Weldments by Shield Metal Arc Welding |
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作 者 | 林岳正; 王星豪; 陳立業; | 書刊名 | 銲接與切割 |
卷 期 | 9:5 1999.09[民88.09] |
頁 次 | 頁56-68 |
分類號 | 472.34 |
關鍵詞 | TMCP鋼; 低溫機械性質; SMAW; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究針對相同成分但不同軋延製程的鋼材(傳統軋延製程 SM490C 與 TMCP 製 程 EH36 )及手工電銲銲件,探索微觀組織型態改變對鋼材在低溫環境下的機械性能影響。 另外對以相同 TMCP 製程而有無微合金添加之鋼材( TMCP EH36 與 TMCP API 5L X65 )及 手工電銲銲件,探索在低溫環境下微合金對鋼材機械性能之作用。結果顯示,這三種鋼板多 道次銲接之銲冠硬度高於銲根, 而且鋼板厚度中心之母材 HAZ 產生富碳之微帶狀組織,使 得 HAZ 附近貧碳肥粒鐵硬度值下降。 三種材料的強度隨著溫度的降低而強度逐漸增強,然 而低溫環境對 TMCP 鋼材延性的影響並不顯著,其母材及銲件隨溫度逐漸下降,伸長量和斷 面縮率變化不大。相同成分不同製程之 SM490C 與 EH36 鋼板比較,由於 TMCP 製程使晶粒 細化、硬脆析出物顆粒小,因此經過 TMCP 製程之 EH36 鋼板母材及銲件之降伏強度與低溫 衝擊韌性皆優於傳統熱軋 SM490C。 比較相同 TMCP 製程不同合金添加之 EH36 與 API 5L X65 鋼板母材及銲件,在低溫環境下添加微合金之 API 5L X65 拉伸強度與低溫衝擊韌性高 於未添加微合金之 EH36。特殊地,三種鋼板在多道次銲接後,由於母材 HAZ 中粗晶區之脆 硬麻田散鐵被再熱成延性較佳之,細晶粒肥粒鐵,使得其 HAZ 衝擊值高於母材。 |
英文摘要 | The purpose of this study focuses on two aspects of low-temperature mechanical properties of steels and its SMAW weldments: (1) the effect of microstructural morphology on the low temperature mechanical properties of steels produced by different process, (2) the effect of microalloying addition on the low temperature mechanical properties of steels under the same Thermo-Mechanically Controlled Processed (TMCP) with accelerated cooling. The results indicate that the hardness of the root in the multipass weld metal is lower than the top bead for these three steels. Furthermore the hardness in the HAZ of middle thickness show a softening region. Lower value of hardness is ascribed to the post heat treatmet of successive passes during multi-pass welding. The ultimate tensile strength and yield strength of experimental steels increase with decreasing temperature, but their ductility almost is remained unchanged. The yield strength and impact toughness of TMCP EH36 steels and its weldments are better than that of the traditional hot rolled SM4900C. The reason attributes to the fine equiaxed grain size produced by accelerated cooling process in EH36. The superior strength and impact toughness of microally addition of API 5L X65 steels and its weldments to EH36 results from very fine precipitates superimposed with fine equiaxed grain and the solid solution strengthing. Especially, the heat affected zone of base metal excels parent metal in impact toughness due to that the brittle grain-coarsened zone was reheated to form better toughness of fine grain ferrite during multipass welding. |
本系統中英文摘要資訊取自各篇刊載內容。