為因應汽車工業界考量降低能源的消耗，鋼鐵業界著手研發新一代高強度高延展性鋼板。本研究擬開發新一代高強度高延展性鋼材做為汽車鋼板材料。本研究係以中錳含量合金鋼透過兩段熱處理，在未經冷軋製程情況下，獲得沃斯田鐵與肥粒鐵極細晶之雙相結構。其中，回火熱處理使組織波來鐵化，如此可消除熱軋板的帶狀結構，進而在兩相區退火處理得到沃斯田鐵和肥粒鐵，此兩相晶粒交錯分佈形成不連續相。結果發現經由550oC回火後，再在700oC退火的兩段式熱處理後，熱軋板的抗拉強度為900 MPa，延伸率為43%，強延積為38.7 GPa%，其機械性質已達第三代先進高強度鋼板之需求。

Automotive industry has been involved in developing the next-generation high strength and high ductility steel, in order to reduce energy consumption and production cost. In this study, an alloy with medium Mn content is subject to two stages annealing process to produce a duplex phase microstructure. The duplex structure which is consists of austenite and ferrite. No cold rolling is involved in the process. The first tempering process makes the most of the material becomes pearlite. The following intercritical annealing transforms the pearlite into a mixture of austenite and ferrite. The results show that after tempered at 550oC and intercritical annealed at 700oC yields the best mechanical properties. The mechanical properties fulfill the requirement for the 3rd generation AHSS.

一、前言 1
二、文獻回顧 2
2-1 錳鋼變形機制 2
2-2 熱處理與微結構關係 3
2-3 微結構對機械性質影響 4
2-4變形結構與機械性質影響 5
2-5細晶尺寸與變形行為 8
三、研究目的 12
第四章　實驗方法 13
4-1實驗材料 13
4-2熱處理方法 13
4-3金相試片準備 13
4-4表面型態觀察 14
4-5 背向散射電子繞射 14
4-6 TEM微觀組織顯微分析 14
4-7 XRD繞射分析 14
4-8機械性質拉伸測試 15
五、實驗結果 16
5-1 熱軋板微結構觀察 16
5-2 熱壓板經回火後微結構觀察 16
5-3 退火後微結構觀察 17
5-4 拉伸變形行為 20
5-5變形組織觀察 20
六、討論 25
6-1 熱處理對微結構演化的影響 25
6-1-1回火熱處理 25
6-1-2 退火熱處理 25
6-2 微結構的相組成和成份分析 26
6-3 變形結構與機械性質影響 27
七、結論 30
八、參考文獻 31

[1] A. Saeed-Akbari, J. Imlau, U. Prahl, and W. Bleck, Metall. Trans., 40A, (2009), 3076.
[2] K. T. Park, K. G. Jin, S. H. Han, S. W. Hwang, K. Choi and C. S. Lee, Mater. Sci. Eng, A527, (2010), 3651.
[3] S. Allain , J.-P. Chateau , O. Bouaziz, S. Migot and N. Guelton, Mater. Sci. Eng., A387-389, (2004), 158.
[4] N.Caban ̃as, J.Penning, N.Akdut, B.De Cooman, Metall Trans A , 37 (2006), 3305–3315.
[5] Y. K. Lee, C. S. Choi, Phys. Metall, Mater.Sci.31 (2000)355–360.
[6] H. Schumann, Kristall, Technik,9(1974)1141–1152
[7] G.B. Olson, M. Cohen, Metall Trans A , 7, (1976), 1897.
[8] G.B. Olson, M. Cohen, Metall Trans A ,7,(1976), 1905.
[9] A. Dumay, J.-P. Chateau, S. Allain, S. Migot ,O. Bouaziz, Mater. Sci. Eng. A ., 184, (2008),483.
[10] I. Gutierrez-Urrutia, S. Zaefferer and D. Raabe, Mater. Sci. Eng., A527, (2010), 3552.
[11] G. Dini, A. Najafizadeh, S.M. Monir-Vaghefi and R. Ueji, J, Mater. Sci. Technol., 26, (2010), 181.
[12] A. Saeed-Akbari, J. Imlau, U. Prahl, and W. Bleck, Metals & Materials Society and ASM International (2009)
[13] P.J. Jacques, Current Opinion in Solid State and Materials Science 8 (2004) 259–265.
[14] 謝郁玲，中山大學碩士論文 (2012)
[15] S.-J. Park, B. Hwang, K.H. Lee, T.-H. Lee, D.-W. Suh and H.N. Han, Scripta Materialia 68 (2013) 365-369.
[16] P.H. Chang, A.G. Preban, Acta Metall. 33 (1985) 897.
[17] M. Delince, Y. Brechet, J.D. Embury, M.G.D. Geers, P.J. Jacques, T. Pardoen, Acta Mater. 55 (2007) 2337.
[18] M. Calcagnotto, Y. Adachi, D. Ponge, D. Raabe, Acta Mater. 59 (2011) 658.
[19] W.Q. Cao, C. Wang, J. Shi, M.Q. Wang, W.J. Hui, H. Dong, Mater. Sci.Eng. A, 528 ,(2011) 6661.
[20] M.Calcagnotto, Y.Adachi, D.Raabe, Acta Mater. 59 (2011) 299.
[21] I. Gutierrez-Urrutia , D. Raabe, Acta Mater. 59 (2011) 6449.
[22] Hao Ding, Hua Ding, Dan Song, Zhengyou Tang, Ping Yang, Mater. Sci. Eng. A ,528 (2011) 868–873.
[23] C.Y. Yu , P.W. Kao, C.P. Chang, Acta Mater 53 (2005) 4019–4028.
[24] J. E. Jin, Y. S. Jung, Y. K. Lee, Mater. Sci. Eng. A, 449–451 (2007) 786–789
[25] H. Aydin, ElhachmiEssadiqi, I. H. Jung, StephenYue, Mater. Sci. Eng. A, 64 (2013) 501–508.
[26] 丁仕旋，錳含量對沃斯田鐵鋼變形雙晶產生機制之影響結案報告 (2011)
[27] 歐志鴻，中山大學碩士論文 (2013)