臺灣博碩士論文加值系統

雙相不銹鋼兼具沃斯田鐵系不銹鋼之耐蝕性與韌性及肥粒鐵系不銹鋼之強度與耐應力腐蝕性，並具備價格上的優勢。近年來，已逐漸發展成一獨特的不銹鋼種，廣泛應用於化學、石油、能源等工業。上述優良之機械與耐蝕性質組合實有賴於穩定的平衡雙相組織，然而雙相不銹鋼之高合金含量及雙相組織特性，大大提高了二次相 (secondary phases) 之析出傾向，對於鋼材的應用性質具有關鍵性的影響。因此探討雙相間的變態行為與析出相的形成條件與相關因素一直是雙相不銹鋼的研究主題之一。

Duplex stainless steels with reasonable cost combine the attractive properties of single-phase stainless steels, such as the corrosion resistance and the toughness of austenitic stainless steel and the strength and stress corrosion resistance of ferritic stainless steel. In recent years, duplex stainless steel developed as an unique grade of stainless steel have been extensively used in the fields of chemical, petrochemical and energy industries. It had been well known that the excellent performance of duplex stainless steel is associated with the stable duplex structure consisted of equivalent phase components, i.e. austenite and delta ferrite. Unfortunately, the precipitation of various secondary phases is greatly encouraged by the high alloy content of duplex alloy and the morphology of duplex structure. Therefore, the property of duplex stainless steel influenced by the secondary precipitates is extensively concerned for the application of duplex stainless steel.

Chapter One
General introduction...........................................1
Chapter Two
Literatures Survey.........................................................4
2-1. Development of duplex stainless steel.....................4
2-2. Advantages of duplex stainless steel......................5
2-2-1 High corrosion resistance................................5
2-2-2 High mechanical strength.................................5
2-2-3 High stress corrosion cracking resistance................7
2-3. Metallurgical aspects of duplex stainless steel...........8
2-3-1 Alloy design.............................................8
2-3-2 Phase equilibrium.......................................10
2-3-3 Element partitioning................................... 11
2-4. Production criterion of wrought duplex stainless steel...12
2-4-1 wrought duplex structure ....................................................12
2-4-2 Heat-affected zone .....................................13
2-5 Secondary precipitates in duplex stainless steel .........14
2-5-1 M23C6 carbide ..........................................16
2-5-2 Cr2N nitride ...........................................16
2-5-3 Sigma phase.............................................17
2-5-4 Chi phase...............................................18
2-5-5secondary austenite......................................19
2-5-6 Other intermetallic precipitates........................20
Chapter Three
Effects of solution treatment and continuous cooling on the sigma phase precipitation in 2205 duplex stainless steel
3-1. Introduction ............................................33
3-2. Experimental method......................................34
3-3. Result and Discussion....................................35
3.3.1. Morphology observation and Composition analysis........36
3.3.2. TEM observation ofσprecipitation......................39
3.3.3. Diffraction Analysis ofσphase.........................41
3-4. Conclusions..............................................44
Chapter Four
Microstructural evolution of simulated heat affected zone in 2205 duplex stainless steel
4-1. Introduction ............................................67
4-2. Experimental method......................................68
4-3. Result and Discussion....................................70
4.3.1 Optical metallograghy of simulated HTHAZ................70
4.3.2 Transmission electron microscopy of simulated HTHAZ.....71
4.3.3 Structural evolution during high-temperature exposure...75
4.3.4 Variants of Cr2N precipitates...........................76
4-4. Conclusions..............................................78
Chapter Five
The effect of high-temperature exposure on the microstructural stability and impact resistance of 2205 duplex stainless steel
5-1. Introduction............................................101
5-2. Experimental method.....................................101
5-3. Result and Discussion...................................103
5.3.1 Impact resistance......................................103
5.3.2 The microstructural evolution during aging.............104
5.3.3 TEM observation on secondary precipitates.................................................106
5-4. Conclusions.............................................107
Chapter Six
General Conclusions .........................................125
Futher works.................................................127
Appendices
Ⅰ. Intensity of diffraction spots ..........................128
Ⅱ. Interpretation of electron diffraction pattern ..........131
Ⅲ. Coordination transformation matrix ......................138
Ⅳ. Orientation relationship between simple crystals.....................................................143
References...................................................148

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