臺灣博碩士論文加值系統

本研究探討LPG球槽常用之SPV-50Q高張力鋼板其在壓力容器長時期使用後其顯微組織及韌性之變化。本實驗時將針對SPV-50Q鋼板原材及受到氫誘裂的兩種鋼材，分別取垂直與平行於裂縫之方向試片，再進行破裂韌性值之檢測，並且輔以抗拉試驗及衝擊試驗，以瞭解受到氫誘列裂後之SPV-50Q高張力鋼材，其機械特性之劣化程度，以期供材料安全與保固之參考數據資料庫。實驗結果顯示，在受到氫誘裂後之鋼材，均受到一定程度之劣化，當原材受力方向與滾軋方向垂直時，其拉伸強度、衝擊韌性值、破裂韌性均低於受力方向與滾軋方向平行時，但當受劣化後之鋼材，其拉伸強度與破裂韌性值則相差不大，是由於受劣化後之鋼材，其滾軋方向已不是影響其破斷之主要機構。

This research is to study the fracture toughness behavior of SPV-50Q high tension steel in LPG pressure vessel. The as-received SPV-50Qsteel, as well as the steel that has been subjected to hydrogen-induced cracking, will be investigated. The orientation of the fracture toughness specimen will be selected such that the fracture path will be vertical or parallel to the existing hydrogen-induced cracking (HIC) paths. Tensile test will be performed as well to substantiate the fracture toughness data. It is hoped that at the completion of this research the extend of deterioration in the mechanical properties of the LPG SPV-50Q steel vessel before and after HIC attack will be more clearly understood. This will provide some valuable date base for material safety in LPG pressure vessel.
The tensile strength of paralleled rolling direction high than vertical rolling direction in SPQ-50Q non-used material. It made by machining hard. The tensile strength of SPV-50Q is large decrease whether in paralleled rolling direction and vertical rolling direction but the elongation has a value of level. The effect of hydrogen on ductile fracture in two rolling direction, paralleled and vertical, have been machining. In used material, the mechanism property is poor. Initiation of microvoids during test occurred, together with enhance microvoid growth. The observation of impact test, the impact value is not large decrease, the fracture in this cause appears consistent with the inclusions. The final fracture process of fatigue cracking has transparently divergent direction in cracking progression. The major effect of fracture toughness for non-used material is rolling direction. The internal microcracking is significantly increase by hydrogen with decrease fracture toughness for used material.

Table of Contents..............................................1
List of Tables.................................................3
List of Figure.................................................4
Abstract.......................................................7
Chapter 1 Introduction.........................................8
Chapter 2 Literature Survey...................................10
2-1 LPG Pressure Vessels....................................10
2-2 Hydrogen embrittlement mechanism........................10
2-3 The influence of hydrogen for mechanical property.......11
2-4 Influence of hydrogen for fracture model................12
2-5 Hydrogen induced cracking, HIC )........................14
2-6 Fracture mechanics analysis.............................16
2-6-1 Introduction of fracture mechanics..................17
2-6-2 Crack growth........................................17
Chapter 3 Experimental Procedures.............................20
3-1 Materials...............................................20
3-2 Experiment procedure....................................20
3-3 The analysis of chemical composition....................20
3-4 Metallographical observation............................20
3-5 Specimen manufacture....................................21
3-6 Hardness test...........................................21
3-7 Cathodic hydrogen charging................................21
3-8 Mechanical property test................................22
3-8-1 Tension Testing.........................................22
3-8-2 Impact Testing..........................................22
3-9 Testing of Fracture Toughness...........................22
3-9-1 Experiment parameters...............................23
3-9-2 KⅠC Calculation....................................23
3-9-3 KC Calculation......................................24
Chapter 4 Results and Discussion..............................25
4-1 Chemical composition analysis...........................25
4-2 Metallographical observation..............................25
4-2-1 Rolling direction of the specimen.......................25
4-2-2 Observation of microstructure...........................25
4-3 Mechanical properties.....................................25
4-3-1 Hardness analysis.......................................25
4-3-2 Tensile strength and elongation.........................26
4-3-3 Impact toughness........................................26
4-3-4 Fracture toughness......................................27
4-3-4-1 The relationship between KC and rolling direction.....27
4-3-4-2 Fracture type of fatigue precracking..................28
4-3-5 Fracture surface........................................28
4-4 Observation of fracture surface...........................29
4-4-1 Observation of SEM fracture surface in tensile specimen.29
4-4-2 Observation of SEM fracture surface in impact specimen..30
4-4-3 Observation of SEM fracture surface in compact specimen
C (T) specimen..........................................30
Chapter 5 Conclusions.........................................32
Chapter 6 Conferences.........................................33

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