臺灣博碩士論文加值系統

本研究以309L為銲料，利用GTAW將AISI 1015低碳鋼與AISI 304不銹鋼異質銲接，銲接件再進行600 ℃與750 ℃持溫1 ~ 240小時之高溫氧化、600 ℃ 1小時加熱1小時冷卻共85 ~ 384次之循環氧化與550 ℃之LiNO3-NaNO3-KNO3共晶融鹽250 ~ 1000小時靜滯腐蝕實驗，藉此探討銲接誘發之組織變化在高溫氧化的影響。
研究結果顯示，皮膜厚度和金屬損失量隨氧化時間之增加、溫度上升而上升，隨底材鉻含量上升而下降。HAZ晶粒粗細的改變，對高溫恆溫氧化、高溫循環氧化、LiNO3-NaNO3-KNO3共晶融鹽腐蝕沒有影響。1015低碳鋼之HAZ經高溫循環氧化後，因熱應力之影響產生片狀鐵氧化物，其面積隨著循環次數之增加而減少。

Gas tungsten arc welding was applied to join AISI 304 stainless steel and AISI 1015 low carbon steel with consumable – AISI 309L stainless steel wires. This study investigated the effect of the weldments on the high-temperature oxidation behavior. The oxidation test was performed by placement weldments at 600 ℃ and 750 ℃ for 1 ~ 240 hours. The thermal cycle oxidation of the weldments at 600 ℃ with the hold time 85 ~ 384 times was conducted. Also, the corrosion test was performed by immersing weldments in static molten LiNO3-NaNO3-KNO3 eutectic salt at 550 ℃ for 250 ~ 1000 hours.
The result shows that the weight loss and the thickness of corrosion scales of the samples were directly proportional to the corrosion time and temperature, however, were inversely proportional to the chromium content. The grain size changes were not influenced to the high temperature oxidation. The AISI 1015 was produced plate-like iron oxides, and the iron oxides area was decrease as the cycle-times was arising.

第一章 前言 1
第二章 文獻回顧 2
2.1　碳鋼及不銹鋼材料 2
2.1.1　碳鋼 2
2.1.2　不銹鋼 2
2.2　高溫氧化 4
2.2.1　氧化熱力學 4
2.2.2　氧化機構 7
2.2.3　影響高溫氧化之因素 7
2.3　高溫氧化動力學 9
2.3.1　氧化皮膜完整性 9
2.3.2　氧化動力學 11
2.3.3　氧化皮膜應力的產生 12
2.3.4　氧化皮膜破裂模式 14
2.4　合金元素對鐵基合金高溫氧化之作用 16
2.4.1　純鐵(Fe)的高溫氧化 16
2.4.2　鉻(Cr)元素的作用 19
2.4.3　鎳(Ni)元素的作用 21
2.4.4　錳(Mn)元素的作用 21
2.5　共晶融鹽腐蝕 22
2.5.1　儲熱融鹽的選擇 22
2.5.2　LiNO3-NaNO3-KNO3共晶融鹽之熱化學性質 26
2.5.3　鐵鉻合金於共晶融鹽中之腐蝕 28
2.5.3.1　NaNO3-KNO3共晶融鹽之腐蝕 28
2.5.3.2　Li2CO3-K2CO3共晶融鹽之腐蝕 29
2.5.4　不同氣氛對共晶融鹽之熱化學影響 31
2.6　銲接製程 32
2.6.1　氣體遮護鎢極電弧銲接 32
2.6.2　銲件區域之定義 33
2.6.3　銲接區域溫度差異 34
2.7　銲接件之高溫氧化 38
第三章 實驗方法 41
3.1　實驗材料 42
3.2　試片準備 42
3.3　高溫恆溫氧化試驗 43
3.4　高溫循環氧化試驗 45
3.5　融鹽腐蝕試驗 47
3.6　分析設備與方法 50
3.6.1　分析設備 50
3.6.2　分析方法 50
第四章 異質銲接之銲後組織 53
4.1　巨觀試驗 53
4.2　1015低碳鋼母材與HAZ 53
4.3　309L不銹鋼銲道與熔融區(Fusion Zone) 56
4.4　304不銹鋼母材與HAZ 56
第五章 實驗結果與討論 61
5.1　高溫恆溫氧化試驗 61
5.1.1　氧化形態外觀 61
5.1.2　金屬損失量 62
5.1.3　氧化形態與氧化產物分析 67
5.1.4　討論 82
5.2　高溫循環氧化 83
5.2.1　氧化形態外觀 83
5.2.2　重量增重 83
5.2.3　氧化形態與氧化產物分析 85
5.2.4　討論 95
5.3　融鹽腐蝕試驗 101
5.3.1　腐蝕形態外觀 101
5.3.2　金屬損失量 103
5.3.3　腐蝕型態與腐蝕產物分析 105
5.3.4　討論 115
5.4　銲接對高溫腐蝕的作用 116
第六章 結論 118
參考文獻 119

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