臺灣博碩士論文加值系統

2205雙相不�袗�為一種具備肥粒鐵系不�袗�之高強度、高抗應力腐蝕之能力與沃斯田鐵系不�袗�之高延展性、均勻腐蝕性的材料。本研究對2205雙相不�袗�進行兩部份的探討，其一為利用Gleeble熱壓縮模擬機瞭解其高溫機械性質。另一研究為2205雙相不�袗�在不同冷軋延率與退火溫度條件下對其冷軋板的優選方位與機械性質的效應。
第一部份研究結果顯示，材料在應變溫度1000℃-1200℃時，當應變溫度越低時，所對應的真應力值越高，在應變溫度1000℃時達到200MPa。當應變速率愈低時，其所對應的應力值也會隨之變小。在相同的應變速率下，流應力值隨溫度的增加而隨之降低，在相同應變溫度下，流應力值隨著應變速率下降而隨之下降。當應變速率越高時，其所相對應的活化能越低。在應變速率為10-3S-1的條件中，溫度在1100~1200℃時，活化能Q值會大幅攀升至1200 KJ/mol，顯示其變形機制由差排滑動轉向晶體擴散的機制。此材料在溫度超越1150℃時，已經達到超塑性的特性狀態
第二部份研究結果顯示，雙相不�袗�在冷軋時，應變量越大時，會造成其γ相比例的降低，以及兩相分佈型態的變化。優選方位方面，在冷軋再結晶退火前後之α相主要優選方位皆為{001}<uvw>、{111}<uvw>方位，而γ相在再結晶退火前後之優選方位主要為{011}<100>、{011}<3-11>。在機械性質與成形性方面，與冷軋延率有著較密切的關係，皆以最高軋延率67%有較佳的性質，r值約在1.0~1.2之間。與退火溫度的效應似乎比較不明顯。與成型性有關之α相{111}<uvw>優選方位，隨著軋延率增加的效應，有明顯的增強趨勢變化。

The high temperature mechanical behaviors and annealed cold-rolled sheet mechanical properties of 2205 duplex stainless steel were investigated in this study. There are two parts in this thesis.The first part is to analyse the mechanical behaviors of 2205 DSS deformed at 1025~1100℃ by Gleeble machine. The second part is to study the effects of cold-rolled reduction and annealing temperature on the microstructure, texture, mechanical properties and formability of cold rolled steel sheets.
In the first part, during hot compression at 1000~1200℃, flow stress decreased with increasing deformation temperature and decreasing strain rate. The maximum flow stress is 200MPa at deformation temperature 1000℃. When temperature is above 1150℃, this material has the superplastic behavior. When this material deformed at strain rate 10-3S-1 and 1100~1200℃,the activation energy increased from 440 to 1200 KJ/mol. It indicates there exists different deformation mechanisms.
In the second part, as the cold-rolled state, the main texture of α phase is {001}<uvw>、{111}<uvw> and the main texture of γ phase is {011}<100>、{011}<3 1>. After cold-rolled annealing, the texture types of both phases doesn’t change. Furthmore, the mechanical properties and formability is more closely related to cold-rolled reduction than annealing temperature. It closely correlated to two phases distribution. It has better mechanical properties and formability as cold-rolled reduction increasing. The values are between 1.0~1.2.

中文摘要…………………………………………………………………………... i
英文摘要…………………………………………………………………………... ii
誌謝………………………………………………………………………………... iii
目 錄……………………………………………………………………………... iv
表目錄……………………………………………………………………………... vi
圖目錄……………………………………………………………………………... vii


1.1 前言……………………………………………………………………..…….. 1
1.2 雙相不�袗�之文獻回顧與理論背景………………………………………… 1
1.2.1 雙相不�袗�之簡史.………………….…………………………………... 1
1.2.2 雙相不�袗�之結構概況……….………………………………………… 2
1.2.3 雙相不�袗�之機械性質…………………………………………………. 2
1.2.4 金屬之優選方位概論…….……………………………………………… 3
1.2.4.1 優選方位量測之方法……………………………………………….. 3
1.2.4.2 不�袗�優選方位的發展…………………………………………….. 4
1.3 2205雙相不�袗�之國內外研究概況………………………………………… 5
1.4 研究動機與目的…………………………………………………….………... 6
1.5 本論文將探討的課題………………………………………………….……... 6

第二章 實驗方法…….………………………………………………………..….. 16
2.1 Gleeble熱壓縮實驗方法與流程……………………………………………… 16
2.1.1 合金成份與鋼胚製造流程………………………………………………. 16
2.1.2試片準備………………………………………………………………….. 16
2.1.3 Gleeble熱壓縮試驗…………………………………………….………… 16
2.1.4數據分析……………...……………………………... …………………… 17
2.1.5本構方程式…………………………………………………….…………. 17
2.1.6金相顯微組織觀察…………………………………………………….…. 18
2.1.7穿透式電子顯微鏡觀察微結構型態…………………………………….. 19
2.2冷軋板實驗流程………………………………………………………………. 19
2.2.1鋼胚合金成份與製造流程……………………………………….………. 19
2.2.2熱軋……………………………………….………………………………. 19
2.2.3熱軋板退火……………………………………………………………….. 20
2.2.4熱軋板表面�蚰皏h除(噴砂處裡)………………………………………... 20
2.2.5冷軋………………...……………………………………………………… 20
2.2.6冷軋板再結晶退火……………………. ………………………………… 20
2.2.7機械性質之量測與試片準備……………………………………………. 21
2.2.8成形性之量測與試片準備………………………………….…………… 21
2.2.9顯微微觀組織觀察與試片準備………………………………..….……... 22
2.2.10 兩相含量之定量分析實驗………………………………..….………… 23
2.2.11 微硬度測試………………………………..….….. ……………………. 23
2.2.12 優選方位之量測與試片準備………………………………..….……… 23

第三章 高溫熱壓縮之機械性質結果與討論…….…..………………………….. 31
3.1高溫熱壓縮實驗之金相顯微組織觀察………………………………………. 31
3.2不同應變溫度與應變速率條件之機械性質…………………………………. 31
3.2.1應力應變關係圖………………………………………………………….. 31
3.2.2流變應力與溫度關係結果分析與討論………………………………….. 32
3.2.3活化能Q值結果分析與討論……………………………………………. 32
3.2.4應變速率靈敏度m值結果分析與討論…………………………………. 32

第四章 冷軋退火條件對冷軋鋼片機械性質影響之結果與討論………………. 65
4.1冷軋板退火溫度與不同軋延率對其金相顯微組織之影響…….…………… 65
4.1.1 冷軋未退火狀態金相顯微組織…………………………………………. 65
4.1.2 不同冷軋退火溫度與冷軋延率對其金相顯微組織之影響……………. 65
4.2 硬度 66
4.3冷軋板退火溫度與不同軋延率對其冷軋鋼片優選方位(Texture)之影響….. 66
4.4冷軋板退火溫度與不同軋延率對其冷軋鋼片機械性質與成型性之影響…. 67
4.5 探討優選方位與機械性質、成形性間之相互關係。……………………… 67

第五章 總結論…………………………………………………………………... 101
第六章 未來方向………………………………………………………………... 103
參考文獻…………………………………………………………………………... 104
作者簡歷…………………………………………………………………………... 108

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