麻時效鋼是一種以低碳麻田散鐵為基材，經熱處理析出金屬間化合物來達到時效硬化的高強度、高韌性合金鋼。麻時效鋼加工後，在加工完成面會殘留鱗片狀缺陷，影響加工完成面品質。經實驗結果發現，鱗片狀缺陷的形成，起因於刃口積屑，刀具的刃口積屑堆積使得刀鼻圓角半徑增加，造成在刀具鼻端與工件接觸點附近的切屑厚度小於最小未變形切屑厚度而無切削作用，同時局部的高壓力與高切削溫度使得殘留材料被擦磨而在刀腹面與加工面間發生材料側向流動的現象，導致進給紋路邊緣有毛邊產生，會在加工完成面上殘留鱗片狀缺陷。此外，切削速度的提昇會形成鋸齒狀切屑（Saw-Tooth Chip），該切屑的兩邊呈特殊地鋸齒狀（Serration）外形，使得切屑兩自由邊緣與刀具接觸不均勻，形成不均勻的接觸應力，易導致刀具有切屑外緣刻痕磨耗的發生。

Maraging steel, which exhibits combination of strength and toughness, is an alloy steel of low-carbon martensite hardened by precipitation. The scale-surface damage often remains on freshly machined surface when solution-treated and aged 18﹪Ni maraging steel is machined. This kind of damage downgrades the quality of the machined surface. It is found from experiment that scale-surface damage is attributed to the “built-up edge”, which is generated under certain cutting speed ranges in machining process. Formation of built-up edge causes an increase of tool nose radius, and the chip thickness is reduced as a result. The residual material is squeezed between the flank face of tool and the machined surface of workpiece, when chip thickness close to trailing edge is less than the minimum undeformed chip thickness under high temperature and stress. The “squeezing” thereafter leads to burrs formed on the feed mark ridges and scale-surface damage caused on the freshly machined surface. In addition, the saw-tooth chip that has the specific chip edge serration is formed with an increase of cutting speed. The serration at the free surface of chip causes unbalanced stress on the tool resulting in the happening of outer metal chip notch wear.

誌謝 I
中文摘要 II
英文摘要 III
目錄 IV
圖目錄 VI
表目錄 IX
符號說明 X
第一章 導論 1
1-1研究動機 1
1-2文獻回顧 1
1-3本文目的 4
1-4本文內容 4
第二章 相關理論 6
2-1麻時效鋼之材料特性與應用 6
2-1-1 麻時效鋼的分類 6
2-1-2 麻時效鋼的熱處理 7
2-1-3 麻時效鋼的特性 9
2-1-4 麻時效鋼的應用範圍 11
2-2切削力學 12
2-3磨耗理論 18
2-4表面粗造度的表示法 23
2-4-1 表面組織定義 24
2-4-2 表面粗糙度的表示法 25
2-5 毛邊種類 27
第三章 實驗設備與方法 29
3-1實驗設備 29
3-2實驗方法 34
第四章 實驗結果與討論 37
4-1刀具磨耗機制 37
4-1-1 切屑外緣刻痕磨耗 38
4-2-2 刃口積屑 42
4-2 完工表面型態 48
4-2-1 毛邊形成機制 51
第五章 結論與建議 57
參考文獻 59
作者簡介 63

[1] J.A. Bailey,“Surface damage during machining of annealed 18﹪nickel maraging steel. Part 1-unlubricated condition.”Wear,Vol.42, 1977, pp.277-296.
[2] J.A. Bailey,“Surface damage during machining of annealed 18﹪nickel maraging steel. Part 2-lubricated condition.”Wear,Vol.42, 1977, pp.297-303.
[3] J.A. Bailey,“Surface damage during machining of solution treated and aged 18﹪nickel maraging steel. Part 1-unlubricated condition.”Wear,Vol.44, 1977, pp.361-370.
[4] J.A. Bailey,“Surface damage during machining of solution treated and aged 18﹪nickel maraging steel. Part 2-lubricated condition.”Wear,Vol.44, 1977, pp.371-376.
[5] J.A. Bailey and S. Jeelani.“Residual stress distribution in machining annealed percent nickel maraging steel.”Journal of Engineering Materials and Technology, Trans. ASME, Vol.108, 1986, pp.93-98.
[6] J.A. Bailey and S. Jeelani, “State of The Subsurface Region in Machining-Solution-Treated and Aged 18﹪Ni Maraging Steel.” Wear, Vol.72, 1981, pp.237-243.
[7] S. Jeelani,“Measurement of temperature distribution in machining using IR photography.”Wear, Vol.68, 1981, pp.191-202.
[8] S. Jeelani, ”Subsurface Plastic Deformation in Machining Annealed 18﹪ Ni Maraging Steel.” Wear, Vol.81. 1982, pp.263-273.
[9] N. Ueda and T. Matsuo, ”Analysis of saw-toothed chip formation.” Memoirs of the Faculty of Engineering, Kumamoto University, Vol.28, 1983, pp.1-19.
[10] A.Ya. Zaslavskii, V.A. Strizhak and L.M. Kuznetsov, ”Improvement in the machinability of maraging steels by microalloying with selenium.” Metal Science and Heat Treatment, Vol.20, 1978, pp.1004-1008.
[11] R.F. Decker and S. Floreen, Recent developments and application. R. K. Wilson, ed.,“The Minerals, Metals and Materials Society.”,1988, p.1.
[12] G.P. Contractor, ”The Marvel of Maraging.” J. Metals, 1966, p.195.
[13] R.F. Decker , J.T. Eash and A.J. Goldman , ”18﹪Nickel Maraging Steel.” Trans. A.S.M., Vol.55, 1962, p.58.
[14] W. Sha, A. Cerezo and G.D.W. Smith, ”Phase Chemistry and Precipitation Reaction in Maraging Steels：PartⅡ. Co-Free T-300 Steel.” Met. Trans. A, Vol.24A, 1993, p.1233.
[15] V.K. Vasudevan, S.J. Kim and C.M. Wayman, ”Precipitation Reactions and Strengthening Behavior in 18Wt Pct Nickel Maraging Steels.” Met. Trans. A, Vol.21A, 1990, pp.2655-2660.
[16] ASM Handbook Committee, Metals handbook, American Society for Metals, Metals Park, Ohio, 1989.
[17] Higgins and R. Aurelius, Engineering metallurgy, E. Arnold, London, 1993.
[18] R. E Smallman, Modern physical metallurgy, Butterworth, London, 1985.
[19] 童山,”概論麻時效鋼”,機械月刊十四卷三期,民77年3月,pp.101-103.
[20] “The Online Materials Information Resource.” http//www.matweb.com.（4 Apr. 2002）
[21] D. T. Peters and C. R. Cupp, “The Kinetics of Aging Reactions in 18Pct Ni Maraging Steels.” Trans. of the Metal. Society of AIME, Vol.236, 1966, p.1422.
[22] B.Z. Weiss, ”Proc. Int. Conf. On Recent Development in Specialty Steels and Hard Materials.” South Africa. N.R. Comins and J.B. Clark, eds. , Pergamon Press, 1988, p.35.
[23] H. J. Rack and D. Kalish, ”The Strength and Fracture Toughness of 18Ni（350）Maraging Steel. ” Met. Trans. A, Vol.2, 1971, pp.3011-3020.
[24] Samuels and L. Ernest, Metals engineering, ASM International, Metals Park, Ohio, 1988.
[25] Leonard E. Samuels, Metals Engineering a Technical Guide, Carnes Publication Services, Inc., U.S.A, 1988.
[26] R.F. Decker, Source Book on Maraging Steels, ASM International, Metals Park, Ohio, 1979.
[27] M .C. Shaw, Metal Cutting Principles, Oxford Science Publication, New York, 1997.
[28] S. Ramalingam and P.K. Wright, “Abrasive Wear in Machining: Experiment with Material of Controlled Microstructure ” Journal of Engineering Materials and Technology, Trans. ASME, Vol.103, 1981, 151-156.
[29] R. Ramaswami, ”The effect of the Build-up-Edge (BUE) on the Wear of Cutting Tools.” Wear, Vol.18, 1971, pp.1-10.
[30] 王廷飛編,表面組織解說,前程出版社,1985.
[31] 宋友華、張郭益,”表面粗糙度量測參數之新趨勢”,機械月刊二十七卷十一期,民國90年11月, pp.378-391.
[32] L.K. Gillespie and P.T. Blotter, ”The Formation and Properties of Machining Burrs.” Journal of Engineering for Industry, Trans. ASME, Vol.98 ,1976, pp.66-74.
[33] K. Nakayama and M. Arai, ”Burr Formation in Metal Cutting.” Annals of the CIRP, Vol.36, 1987, pp.33-36.
[34] G. Warnecke and P. Bach, ”Mechanical and Material Influences on Machined Surface in Precision Turning of Steel with Ceramics.” Proceedings of the 16th North American Research Conference, 1988, pp.209-216.
[35] A.J. Pekelharing and C.A. Gieszen, ”Material Side Flow in Finish Turning.” Annals of the CIRP, Vol.20, 1971, pp.21-22.
[36] H.A. Kishawy and M.A. Elbestawi, ”Effects of Process Parameters on Material Side Flow during Hard Turning. ”International Journal of Machine Tools & Manufacture, Vol.39, 1999, pp. 1017-1030.
[37] 陳志名,面銑削Inconel-718刀具破壞之研究,國立台灣大學碩士論文,民國83年6月。
[38] T. Kitagawa, A. Kubo and K. Maekaka, ”Temperature and Wear of Cutting Tools in High-Speed Machining of Inconel 718 and Ti-6Al-6V-2Sn.”Wear, Vol.202, 1997, pp.142-148.