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題名 | 高入熱量電渣銲接TMCP結構鋼板機械性質與顯微組織之研究=Study on the Mechanical Property and Microstructure in High Heat Input Electro-Slag Welds of TMCP Steel Plate |
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作 者 | 林英志; | 書刊名 | 材料科學 |
卷期 | 30:4 1998.12[民87.12] |
頁次 | 頁297-311 |
分類號 | 472.14 |
關鍵詞 | TMCP結構鋼板; 高入熱量電渣銲接; 機械性質; 顯微組織; TMCP structural steel plate; High heat input ESW; Mechanical property; Microstructure; |
語文 | 中文(Chinese) |
中文摘要 | 50mm厚熱機軋延鋼板(Thermo-mechanically controlled process-TMCP steel plate),以高入熱量電渣銲接 (ESW) 後,銲道出現三種不同主要顯微組織; (1) 不整形肥 粒鐵 (allotriomorphic ferrite- α ), (2) 費德曼肥粒鐵 (Widmanstatten ferrite - αw),(3) 針肥狀粒鐵 (acicular ferrite - αa), 銲道優異的韌性歸因於銲道針狀肥 粒鐵 (acicular ferrite) 的交叉排列分佈,將大的沃斯田鐵晶粒分切成許多細小交叉的針 狀肥粒鐵晶區,進而阻折 (deflection) 裂痕的延伸,而使銲道韌性獲得最佳的結果。銲道 針狀肥粒鐵類似下變韌鐵組織,不同的是銲道針狀肥粒鐵內碳化物的析出方向是平行於銲道 針狀肥粒鐵晶軸劈開面 (habit plane),由於碳化物的析出,使得銲道針狀肥粒鐵發生整合 應變 (coherent strain),因而提高了銲道針狀肥粒鐵的強度與韌性,碳化物為料方晶結構 (orthorhombic crystal structure), 其晶格常數 (lattice parameter) 為 a=4.704, b=4.318, c=2.830, 析出相碳化物與針狀肥粒鐵兩者的結晶方向關係 (orientation relationships) 為 [244]//[113] αa,[010] //[012] αa,[220]//[133] αa。 TMCP 結 構鋼板高入熱量電渣銲接後,熱影響區發生晶粒粗大化及產生費德曼肥粒鐵 (Widmanstatten ferrite- α ) 組織, 銲接時添加微量的鈦 (Ti) 鈮 (Nb) 元素,對銲道 韌性的提升毫無幫助,反而促使銲件銲道變脆。 |
英文摘要 | After high heat input electro-slag welding (ESW) of a thickness 50 mm thermomechanically controlled process (TMCP) steel plate, the primary microstructure in the weld deposit can be categorised into three morphologies;(1)allotriomorphic ferrite- α,(2)Widmanstatten ferrite- α w, (3)acicular ferrite- α a, The optimal Charpy toughness of the weldment is ascribed to the cross distribution of the acicular ferrite that partitions the large austenite grain to be many acicular cross ferrite grains. The acicular ferrite deflects the cracks during the process of fracture, and ehnances the weldment to achieve the optimal toughness. The acicular ferrite in weld is similar to the lower bainite, but the difference is within the acicular ferrite that the carbide precipitates parallel to the acicular ferrite's habit plane. Due to carbide precipitate within the acicular ferrite, there exists the coherent strain in the acicular ferrite which ehnances the strength and toughness of teh acicular ferrite of the weldment. carbide has a orthorhombic crystal structure, with lattice parameter of a =4.704 A, b=4.318 A, c=2.830 A. The orientation relationships between the precipitate carbide and acicular ferrite are determined to be [244]//[113] α a, [010] //[012] α a, and [220] //[133] α a, respectively. In high heat input electro-slag welding (ESW) of a TMCP steel plate, the coarse grain growth as well as the Widmanstatten ferrite- α w will be generated in the heat-affected zone (HAZ). Addition of a few Ti, Nb elements during the ESW process is not useful in increasing Charpy toughness of the weldment. On the contrary, it will make a brittle weldment. |
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