- 期刊
鍛造零件之鍛造變形率對鍛後滲碳熱處理之影響探討
The Effect of Forging Deformation Rate to the Carburizing Treatment
摘要
鍛造加工是藉著衝擊或擠壓的方式，將材料在不同的模具和工具內，以塑性變形方式改變其形狀但不改變其質量及材料成分的情況下，得到所要求形狀、尺寸及機械性質的零件。鍛造加工可控制金屬的流動及晶粒的結構，而使得鍛造的零件具有良好的機械強度及韌性，需要承受高負載及高使用頻率的機械零件，經常採用鍛件方式製造。低碳鋼料進行鍛造加工以後，必須實施滲碳及淬火處理，以提高其表面硬度。本研究將針對不同百分比鍛造變形率之鍛造鋼料，利用不同滲碳條件實施滲碳及淬火處理，並經滲碳截面顯微組織觀察及硬度測試，以瞭解鍛後鋼料不同晶粒形狀、方位、大小（晶界多寡）對滲碳熱處理的影響，並經由實驗結果，進一步尋找出不同百分比鍛造變形率之鋼料，後續進行滲碳熱處理時之最佳滲碳熱處理條件，以供鍛造加工業及熱處理業實施鋼件鍛後滲碳熱處理時參考。
並列摘要
The forging process was completed by impacting or extruding, the material’s shape could be changed with different die and tool under plastic deformation. After the forging process, with the shape changed and the mass as well as constituent of the material remaining unchanged, the shape, dimension and mechanical property were fit in with the requirement. The metal flow and its’ grain structure could be controlled to get the product with good strength and toughness through the forging process. The mechanical parts with high load and high using frequency were almost manufactured by forging process.After the forging process of the low carbon steel, carburizing and quenching treatment must be taken in order to increase the surface hardness of the work piece. In this study, the carburizing and quenching treatment with different carburizing condition was conducted to the forging parts with different forging deformation rate. From the microstructures observation and micro-hardness test results of the carburized parts, the effect of grain shape, grain orientation and grain size (grain boundary)of the materials to the carburizing treatment could be understood. The optimum carburizing treatment condition also could be obtained for different forging deformation rate. These results could be assisted to the carburizing treatment of the forged parts for the company of forging and heat treatment.