摘 要
本研究乃是以實驗探討的方式，利用表面摩擦攪拌沃斯回火球墨鑄鐵實驗，探討摩擦攪拌對沃斯回火球墨鑄鐵之表面硬度(Surface hardness, SH)、衝擊韌性(Toughness, Tou)、及硬化深度(Hardness depth, HD)等觀察值加工特性影響。由於影響表面摩擦攪拌加工參數眾多，要研究所有的加工參數對加工特性的影響有實際上的困難，因此在本研究的實驗部分，將輔以田口實驗計劃法(Taguchi experimental design method)規劃進行部分的實驗，探討材料高低恆溫回火、轉速、進給速度、攪拌棒直徑、探針直徑及傾斜角度等六個主要的加工參數，並將實驗所得之數據經由統計學的變異數分析(ANOVA)及貢獻度，評估表面摩擦攪拌加工參數對表面硬、衝擊韌性、及硬化深度等沃斯回火球墨鑄鐵特性影響的顯著程度，並求出各摩擦攪拌特性之較佳加工參數水準組合。經由本研究的結果期望能提供沃斯回火球墨鑄鐵摩擦攪拌時加工參數設定的參考依據，以提供相關研究者及業界參考。
關鍵詞：摩擦攪拌、表面性質、沃斯回火球墨鑄鐵
ABSTRACT
In this study, austempering ductile iron (ADI) was surface modified by friction stirring surface
(FSS) to investigate the effects of friction stirring parameters on ADI surface characteristics.
Therefore, parts of experiment were conducted with orthogonal arrays of Taguchi method foreconomically to explore the machining parameters on machining characteristics such as toughness,
surface hardness, hardness depth, and roughness. Besides, through analysis of variance
(ANOVA) and F test of signal to noise (S/N) ratio, the effects of friction stirring parameters such
as rotation speed, feedrate, shoulder diameter, tilt angle, and probe diameter, and austempering
temperature on ADI surface characteristics were determined. From this investigation, the
relations between surface characteristics and friction stirring parameters of ADI via FSS were
established. Furthermore, the significant degree of each parameters affected the surface
characteristics were explored, and the optimal combination levels of the friction stirring parameters
on toughness, surface hardness, and hardness depth was determined. Moreover, the experimental
results could be applied in industrial applications and academic researches.
K eywords: Friction Stirring Surface, Surface Properties, ADI
