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錳鋁元素對TWIP鋼冷軋後材料機械性質影響之研究 = Effect of...

國立高雄大學化學工程及材料工程學系碩士班

錳鋁元素對TWIP鋼冷軋後材料機械性質影響之研究 = Effect of Mn、Al on mechanical properties in TWIP steels after cold rolling

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Effect of Mn、Al on mechanical properties in TWIP steels after cold rolling
作者:	黃玉璋,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2011[民100]
面頁冊數:	111面圖，表 : 30公分;
標題:	TRIP
標題:	TRIP
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/02483982378687424308
附註:	參考書目：面93-99
附註:	103年12月16日公開
摘要註:	本研究主要探討錳鋁元素添加(21Mn、24Mn、24Mn-4Al)對冷軋TWIP鋼主要機械性質影響之研究。主要定義出拉伸速率於3.3×10-3s-1時三種不同成分鋼種其變形機制分別為TRIP及TWIP、TWIP、TWIP及差排滑移。此外，本研究也以(21Mn、24Mn、24Mn-4Al)為材料，進行三種不同拉伸速率(3.3×10-3s-1、3.3×10-2s-1、10-1s-1)，探討其對機械性質之影響。根據熱力學方式計算，不同合金元素添加對疊差能之關係，由計算結果可發現，隨著錳、鋁元素添加對於疊差能皆有提升之作用，經熱力學計算後，21Mn、24Mn、24Mn-4Al之疊差能依序為21.9 mJ/m2 29.2 mJ/m2及58.7 mJ/m2。拉伸速率於3.3×10-3s-1時，24Mn具有最大T.S.×El.為69645.03MPa%，24Mn-4Al其T.S.×El.則為最小43918.75 MPa%，21Mn則介於其兩者之間為54819.04 MPa，21Mn 具有最大T.S.值為907.6MPa，24Mn 具有最大El.值為78.9%，24Mn-4Al具有最大Y.S.值為352.9MPa，由XRD結果顯示24Mn及24Mn-4Al無論拉伸前後皆為穩定γ相，另外21Mn則於拉伸前為γ相為主並同時存在ε相，拉伸後則呈現以ε相為主要相，拉伸後TEM試片觀察，21Mn具有ε相以及雙晶存在，因此其機制主要有TRIP及部分TWIP主導，24Mn則皆為機械雙晶，因此其機制為TWIP主導，最後24Mn-4Al則具有差排糾結以及雙晶，因此其機制主要為差排滑移主導加上部分TWIP。同成分下應變速率對機械性質探討中發現，21Mn隨著速率增加其El.值由60.4%增加至75.7%，T.S.×El.值則由54819.04 MPa%增加至68024.02 MPa%，24Mn其性質則不隨著速率有明顯變化T.S.×El.平均值約為69029 MPa%，24Mn-4Al其性質也不隨著速率有明顯變化T.S.×El.平均值約為41326 MPa%。 This study focused on the effect of Mn and Al alloys on the mechanical properties in cold-rolled TWIP steels, however, the effect of strain rate on mechanical properties was also investigated. In this study, steels were adopted as the test materials. According to thermodynamic calculation, the stacking fault energy of the 21Mn、24Mn and 24Mn-4Al were 21.9 mJ/m2, 29.2 mJ/m2 and 58.7 mJ/m2, respectively. It reveals that stacking fault energy increased with addition of manganese and aluminum.As the mechanical property, tensile test was carried out to investigate the TWIP steels tensile strength (T.S.), elongation (El.), and toughness (T.S.×El.) with various strain rates of 3.3×10-3s-1、3.3×10-2s-1、10-1s-1. The results showed that 21Mn possessed the maximum (T.S.) of 907.6MPa. and 24Mn possessed the maximum elongation (El.) of 78.9%. In addition, 24Mn-4Al possessed the maximum Y.S. of 352.9MPa. Summary the results of mechanical properties showed that 24Mn steel possessed the superior toughness of 69645.03MPa% (T.S.×El. value), while strain rate of 3.3×10-3s-1. 21Mn and 24Mn-4Al steels were 54819.04 MPa% and 43918.75 MPa%, respectively. From XRD results, 24Mn and 24Mn-4Al steels possessed stableγphase, even though after deformed. It was noticed the 21Mn specimen possessed γ(F.C.C.) structure before tensile test and obtained the phase transformation fromγ transform to εafter tensile test. The TEM results revealed ε-martensite and twin co-exist in 21Mn, it supported that deformation mechanism is TRIP and TWIP under tensile test. Only mechanical twin structure was observed in 24Mn, resulting in obtaining TWIP deformation mechanism. Moreover 24Mn-4Al possessed dislocation entanglement phenomenon and twin structure; as a result its deformation mechanism was classified to dislocation slip and partly TWIP mode.As the effect of strain rate on mechanical property with TWIP steels, the elongation (El.) of 21Mn was increased from 60.4% to 75.07% with strain rate increasing. In addition, the value of T.S.×El. was also increased to 68024.02 MPa%. However, 24Mn possessed the highest value of T.S.×El. reached to 69029 MPa%. But the strain rate was not affect the mechanical property of 24Mn-4Al significantly.

錳鋁元素對TWIP鋼冷軋後材料機械性質影響之研究 = Effect of Mn、Al on mechanical properties in TWIP steels after cold rolling
黃, 玉璋

錳鋁元素對TWIP鋼冷軋後材料機械性質影響之研究 = Effect of Mn、Al on mechanical properties in TWIP steels after cold rolling / 黃玉璋撰 - [高雄市] : 撰者, 2011[民100]. - 111面 ; 圖，表 ; 30公分.
參考書目：面93-99103年12月16日公開.
TRIPTRIP

錳鋁元素對TWIP鋼冷軋後材料機械性質影響之研究 = Effect of Mn、Al on mechanical properties in TWIP steels after cold rolling
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330 $a 本研究主要探討錳鋁元素添加(21Mn、24Mn、24Mn-4Al)對冷軋TWIP鋼主要機械性質影響之研究。主要定義出拉伸速率於3.3×10-3s-1時三種不同成分鋼種其變形機制分別為TRIP及TWIP、TWIP、TWIP及差排滑移。此外，本研究也以(21Mn、24Mn、24Mn-4Al)為材料，進行三種不同拉伸速率(3.3×10-3s-1、3.3×10-2s-1、10-1s-1)，探討其對機械性質之影響。根據熱力學方式計算，不同合金元素添加對疊差能之關係，由計算結果可發現，隨著錳、鋁元素添加對於疊差能皆有提升之作用，經熱力學計算後，21Mn、24Mn、24Mn-4Al之疊差能依序為21.9 mJ/m2 29.2 mJ/m2及58.7 mJ/m2。拉伸速率於3.3×10-3s-1時，24Mn具有最大T.S.×El.為69645.03MPa%，24Mn-4Al其T.S.×El.則為最小43918.75 MPa%，21Mn則介於其兩者之間為54819.04 MPa，21Mn 具有最大T.S.值為907.6MPa，24Mn 具有最大El.值為78.9%，24Mn-4Al具有最大Y.S.值為352.9MPa，由XRD結果顯示24Mn及24Mn-4Al無論拉伸前後皆為穩定γ相，另外21Mn則於拉伸前為γ相為主並同時存在ε相，拉伸後則呈現以ε相為主要相，拉伸後TEM試片觀察，21Mn具有ε相以及雙晶存在，因此其機制主要有TRIP及部分TWIP主導，24Mn則皆為機械雙晶，因此其機制為TWIP主導，最後24Mn-4Al則具有差排糾結以及雙晶，因此其機制主要為差排滑移主導加上部分TWIP。同成分下應變速率對機械性質探討中發現，21Mn隨著速率增加其El.值由60.4%增加至75.7%，T.S.×El.值則由54819.04 MPa%增加至68024.02 MPa%，24Mn其性質則不隨著速率有明顯變化T.S.×El.平均值約為69029 MPa%，24Mn-4Al其性質也不隨著速率有明顯變化T.S.×El.平均值約為41326 MPa%。 This study focused on the effect of Mn and Al alloys on the mechanical properties in cold-rolled TWIP steels, however, the effect of strain rate on mechanical properties was also investigated. In this study, steels were adopted as the test materials. According to thermodynamic calculation, the stacking fault energy of the 21Mn、24Mn and 24Mn-4Al were 21.9 mJ/m2, 29.2 mJ/m2 and 58.7 mJ/m2, respectively. It reveals that stacking fault energy increased with addition of manganese and aluminum.As the mechanical property, tensile test was carried out to investigate the TWIP steels tensile strength (T.S.), elongation (El.), and toughness (T.S.×El.) with various strain rates of 3.3×10-3s-1、3.3×10-2s-1、10-1s-1. The results showed that 21Mn possessed the maximum (T.S.) of 907.6MPa. and 24Mn possessed the maximum elongation (El.) of 78.9%. In addition, 24Mn-4Al possessed the maximum Y.S. of 352.9MPa. Summary the results of mechanical properties showed that 24Mn steel possessed the superior toughness of 69645.03MPa% (T.S.×El. value), while strain rate of 3.3×10-3s-1. 21Mn and 24Mn-4Al steels were 54819.04 MPa% and 43918.75 MPa%, respectively. From XRD results, 24Mn and 24Mn-4Al steels possessed stableγphase, even though after deformed. It was noticed the 21Mn specimen possessed γ(F.C.C.) structure before tensile test and obtained the phase transformation fromγ transform to εafter tensile test. The TEM results revealed ε-martensite and twin co-exist in 21Mn, it supported that deformation mechanism is TRIP and TWIP under tensile test. Only mechanical twin structure was observed in 24Mn, resulting in obtaining TWIP deformation mechanism. Moreover 24Mn-4Al possessed dislocation entanglement phenomenon and twin structure; as a result its deformation mechanism was classified to dislocation slip and partly TWIP mode.As the effect of strain rate on mechanical property with TWIP steels, the elongation (El.) of 21Mn was increased from 60.4% to 75.07% with strain rate increasing. In addition, the value of T.S.×El. was also increased to 68024.02 MPa%. However, 24Mn possessed the highest value of T.S.×El. reached to 69029 MPa%. But the strain rate was not affect the mechanical property of 24Mn-4Al significantly.
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