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SAE 4140H合金鋼製六角螺栓回火參數對機械性質、微觀組織影響 = ...

呂東原

SAE 4140H合金鋼製六角螺栓回火參數對機械性質、微觀組織影響 = Effect of tempering on mechanical properties and microstructure of SAE 4140H low-alloy steel hex bolts

Record Type:	Language materials, printed : monographic
Paralel Title:	Effect of tempering on mechanical properties and microstructure of SAE 4140H low-alloy steel hex bolts
Author:	呂東原,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	2013[民102]
Description:	70面圖，表格 : 30公分;
Subject:	鉻鉬合金鋼
Subject:	Chrome-molybdenum alloy steel
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/05049060054464244591
Notes:	參考書目：面59-61
Notes:	102年10月31日公開
[NT 15001349]:	SAE 4140H合金鋼製六角螺栓回火參數對機械性質微觀組織影響
Summary:	本研究以SAE 4140H鉻鉬合金鋼製六角螺栓為實驗材料進行熱處理，觀察其中不同位置的淬火組織，接著施以不同溫度及時間的回火，並探討其回火組織及硬度的差異，透過萬能試驗機取得螺栓回火後抗拉強度、降伏強度等機械性質，最後探討其淬火組織在不同回火時間的硬度變化。由本研究結果顯示，SAE 4140H的淬火麻田散鐵組織會隨心部到外緣距離的不同而有不同的形態及硬度值，也因此回火也是有不同的回火麻田散鐵形態。而在施以不同溫度的回火後，其金相組織會有所不同，且其機械性質會隨著回火溫度的提高而降低。又可以發現在淬火後硬度越高的位置，其回火軟化的速度越快。在其可獲得相同硬度的不同回火參數實驗結果中發現，長時間的回火持溫可獲得更細緻的金相組織形態。另外又針對實驗材料在回火溫度530℃、550℃、570℃中持溫0~120分鐘的硬度變化，可發現持溫時間在30分鐘內的硬度處於快速下降的階段，無法精確地預估其硬度值的變化。 This study is focused on the effect of heat treatment on the mechanical properties of he bolts made of SAE 4140H chromium molybdenum alloyed steel. Sample bolts were selected out from a production line what were quenched and then tempered according to similar heat treatment conditions as running manufacturing. Their mechanical properties were studied via tensile and hardness testing machines. Their microstructures in different positions on cross sectional cut of test bolts were investigated in detail. The experimental results show that the quenched martensite in SAE 4140H varies from inside to the outer edge with different morphology and hardness. This shows that different tempering treatment may cause varied tempered martensite morphology. When samples were tempered by different temperatures microstructure will be changed from martensite to tempered martensite, and its tensile and yield strengths decrease as the tempering temperature increases. And it can be found that the position with higher hardness becomes faster temper softened after quenching. According to the experiment result of the same hardness with different tempering parameter, it shows the prolonged tempering leads to relatively narrow microstructure. Furthermore, an observation on the test materials under the tempering temperature 530℃, 550℃ and 570℃ for 0 to 120 minutes shows that, the hardness of tested bolts decreases rapidly when tempering time is less than 30 minutes. As in this stage, the hardness variation cannot be estimated precisely.

SAE 4140H合金鋼製六角螺栓回火參數對機械性質、微觀組織影響 = Effect of tempering on mechanical properties and microstructure of SAE 4140H low-alloy steel hex bolts
呂, 東原

SAE 4140H合金鋼製六角螺栓回火參數對機械性質、微觀組織影響 = Effect of tempering on mechanical properties and microstructure of SAE 4140H low-alloy steel hex bolts / 呂東原撰 - [高雄市] : 撰者, 2013[民102]. - 70面 ; 圖，表格 ; 30公分.
參考書目：面59-61102年10月31日公開.
鉻鉬合金鋼Chrome-molybdenum alloy steel

SAE 4140H合金鋼製六角螺栓回火參數對機械性質、微觀組織影響 = Effect of tempering on mechanical properties and microstructure of SAE 4140H low-alloy steel hex bolts
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328 $a 碩士論文--國立高雄大學化學工程及材料工程學系碩士班
330 $a 本研究以SAE 4140H鉻鉬合金鋼製六角螺栓為實驗材料進行熱處理，觀察其中不同位置的淬火組織，接著施以不同溫度及時間的回火，並探討其回火組織及硬度的差異，透過萬能試驗機取得螺栓回火後抗拉強度、降伏強度等機械性質，最後探討其淬火組織在不同回火時間的硬度變化。由本研究結果顯示，SAE 4140H的淬火麻田散鐵組織會隨心部到外緣距離的不同而有不同的形態及硬度值，也因此回火也是有不同的回火麻田散鐵形態。而在施以不同溫度的回火後，其金相組織會有所不同，且其機械性質會隨著回火溫度的提高而降低。又可以發現在淬火後硬度越高的位置，其回火軟化的速度越快。在其可獲得相同硬度的不同回火參數實驗結果中發現，長時間的回火持溫可獲得更細緻的金相組織形態。另外又針對實驗材料在回火溫度530℃、550℃、570℃中持溫0~120分鐘的硬度變化，可發現持溫時間在30分鐘內的硬度處於快速下降的階段，無法精確地預估其硬度值的變化。 This study is focused on the effect of heat treatment on the mechanical properties of he bolts made of SAE 4140H chromium molybdenum alloyed steel. Sample bolts were selected out from a production line what were quenched and then tempered according to similar heat treatment conditions as running manufacturing. Their mechanical properties were studied via tensile and hardness testing machines. Their microstructures in different positions on cross sectional cut of test bolts were investigated in detail. The experimental results show that the quenched martensite in SAE 4140H varies from inside to the outer edge with different morphology and hardness. This shows that different tempering treatment may cause varied tempered martensite morphology. When samples were tempered by different temperatures microstructure will be changed from martensite to tempered martensite, and its tensile and yield strengths decrease as the tempering temperature increases. And it can be found that the position with higher hardness becomes faster temper softened after quenching. According to the experiment result of the same hardness with different tempering parameter, it shows the prolonged tempering leads to relatively narrow microstructure. Furthermore, an observation on the test materials under the tempering temperature 530℃, 550℃ and 570℃ for 0 to 120 minutes shows that, the hardness of tested bolts decreases rapidly when tempering time is less than 30 minutes. As in this stage, the hardness variation cannot be estimated precisely.
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