多道次鍛壓晶粒細化製程參數之研究

Investigation of Parameters in a Thermomechenical Process for Grain Refinement Using Multi-Forging

范光堯(Kuang-Jau Fann) ； 曾智益(Chi-Yi Cheng)

《鍛造》 13卷4期 (2004/11) Pp. 13-22

摘要

晶粒細化技術除能提昇金屬材料強度與韌性外，更能改善材料的成形性，因此，本文嘗試探討中碳鋼AISI-1045多道次鍛壓晶粒細化製程參數，期能尋出晶粒細化的最佳製程參數。該製程係藉累積應變的方式，即反覆藉疊合、加熱、鍛壓、淬水以及切斷等熱機製程，以達晶粒細化的目的。本文藉由應用於金屬成形製程模擬的商用有限元素軟體DEFORM 2D，配合實驗設定，以得出較佳的三道次鍛壓晶粒細化製程參數。結果顯示，應用多道次鍛壓製程行晶粒細化時，工件材料在每道次鍛壓前的加熱溫度須較前道次為低，且加熱時間不宜過長，僅需將材料完全加熱均勻即可，並隨即進行鍛壓，且鍛壓速度須適中，不宜過速或過慢。

關鍵字

熱機製程 ； 晶粒細化 ； 多道次鍛壓

並列摘要

Grain refinement can not only improve the strength and the toughness of metals but also enhance those formability. Therefore, this study is proposed to find out the optimum parameters of the multi-forging process for refining the grains in a medium carbon steel AISI-1045. The multi-forging process is a thermomechanical process, which can refine the grains by accumulating strain via repeatedly stacking, heating, forging, quenching, and cutting. In this study, a commercial finite element code DEFORM 2D is used to obtain the optimum multi-forging grain refinement process in three stages after checking with the experimental setup. As a result, to refine the grains using the multi-forging process, the heating temperature must be lower than that in the previous stage, the heating duration should not be longer than the material is heated homogeneously, and the forging rate should also not be too fast or too slow.

並列關鍵字

thermomechanical process ； grain refinement ； multi-forging