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博碩士論文 etd-0701114-225122 詳細資訊
Title page for etd-0701114-225122
論文名稱
Title
熱處理對鐵錳合金鋼機械性質之影響
The effect of heat treatment on the mechanical properties of a steel alloying with Mn element
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
106
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2014-07-24
繳交日期
Date of Submission
2014-08-01
關鍵字
Keywords
微觀組織、沃斯田鐵、TRIP效應、麻田散鐵
TRIP, martensite, austenite, microstructure
統計
Statistics
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中文摘要
本研究利用鐵錳合金鋼經不同熱處理與冷軋過程得到適當的微觀組織使其具有良好的機械性質。實驗發現經過700oC熱處理30分鐘的冷軋板微觀組織為肥粒鐵、沃斯田鐵與少量的碳化物所組成,而此熱處理條件具有適當的沃斯田鐵穩定性,使得在拉伸過程中伴隨著應變誘發麻田散鐵相變化,提高材料的加工硬化率並延遲頸縮的發生而得到高的拉伸強度與高的延伸率,此機械性質以達到第三代先進高強度鋼板的目標。
Abstract
The purpose of this study is to develop third generation advanced high strength steel alloyed with medium Mn content. In this study, the steel alloying with Mn element were processed by cold rolling combined with heat treatment to control the microstructure and the stabilization of austenite. The microstructure obtained consisted of ferrite, austenite, and carbide after 700oC heat treatment. The austenite obtained can be stabilized at room temperature. The steel exhibits high tensile strength and high elongation, which attribute to the occurrence of the strain-induced martensite phase transformation which can significantly increase the work-hardening rate and postpone necking during deformation.
目次 Table of Contents
一、 前言 1
二、文獻回顧 2
2-1 TRIP鋼的變形機制 2
2-2 沃斯田鐵穩定性對TRIP鋼的影響 4
2-2-1合金成分 4
2-2-2晶粒尺寸 5
2-2-3 晶粒形貌 7
2-2-4分布位置 8
2-3 變韌鐵相變化 9
2-4 熱處理對TRIP鋼之微觀組織與機械性質之影響 10
三、研究目的 19
四、實驗方法 20
4-1 實驗材料 20
4-2熱處理流程 20
4-3 金相試片準備 20
4-4掃描式電子顯微鏡 21
4-5 X-ray繞射分析 21
4-6硬度測試 22
4-7拉伸測試 22
五、實驗結果 23
5-1微觀組織 23
5-1-1熱軋板之微觀組織 23
5-1-2熱軋板經過熱處理之微觀組織 23
5-1-3冷軋板之微觀組織 24
5-1-4冷軋板經過熱處理之微觀組織 24
5-2機械性質 25
5-3拉伸破斷面與顯微組織 25
5-4相組成分析 26
5-4-1 EBSD分析 26
5-4-2 X-ray分析 27
5-5化學成分分析 28
5-6 最佳機械性質的熱處理條件經過不同應變量之微觀組織 29
5-7最佳機械性質的熱處理條件之晶粒尺寸 30
六、討論 31
6-1 熱處理對微觀組織的影響 31
6-2 熱處理對機械性質的影響 31
6-3合金成分與機械性質的關係 33
七、結論 35
八、參考文獻 36
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