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博碩士論文 etd-0631113-153408 詳細資訊
Title page for etd-0631113-153408
論文名稱
Title
紅外線退火對中錳含量鋼材之組織與拉伸性質的影響
The effect of infrared annealing on the microstructure and tensile properties of a medium Mn content steel.
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
116
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
2013-07-29
繳交日期
Date of Submission
2013-08-02
關鍵字
Keywords
相分率、殘餘沃斯田鐵、TRIP鋼
retained austenite, phase fraction, TRIP steels
統計
Statistics
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中文摘要
目前國際間將第三代先進高強度鋼板的強度與延伸率的目標範圍定在拉伸強度與延伸率的乘積在20~40GPa%的範圍。為考量成本上的競爭優勢,因而將錳含量降低至10wt%以下,因此本論文研究錳含量10wt%以下鋼材之行為。將鋼材經25%軋延後,將其置於紅外線快速升溫系統中,經由雙相退火區的持溫,觀察雙相TRIP鋼中肥粒鐵及沃斯田鐵相之比例、分佈與成份對其拉伸性質之影響。當以RTA每秒5℃升溫速率至700℃退火2分鐘後,其強延績達到第三代高強度車用鋼板之目標性能。
Abstract
The development of cost effective next generation advance high strength sheet steels (AHSSs) has attracted much attention in the recent years, particularly in the automotive industry. One of the target properties of the AHSSs is to have the product of UTS and elongation has the value between 20 to 40GPa%. To reduce the production coat the AHSSs, it is desirable to have the Mn content to be less than 10wt%. This research studies the microstructure and tensile properties of Mn steels with Mn content less than 10wt%.

It was found that after annealing the cold-rolled sheet at 700℃ by rapid thermal annealing system, RTA, the microstructure consists of ferrite, austenite and martensite. From varies annealing conditions, it has been found that annealing at 700℃ for 2 min can give the best combination of UTS and elongation, which fulfills the target property of the third generation of advance high strength sheet steels.
目次 Table of Contents
目錄
摘要 i
Abstract ii
目錄 iii
表目錄 v
圖目錄 vi
第一章 前言 1
第二章 文獻回顧 2
2-1 TRIP鋼的簡介 2
2-1-1 TRIP鋼 2
2-1-2 TRIP鋼之顯微組織 3
2-2 變韌鐵之相變化 4
2-3 沃斯田鐵穩定機制 5
2-3-1 合金組成對沃斯田鐵之穩定 6
2-3-2 晶粒尺寸對沃斯田鐵之穩定 7
2-3-3 其他因子對沃斯田鐵之穩定 9
2-4 熱處理對TRIP鋼為結構之影響 10
2-4-1 低合金TRIP鋼之熱處理 10
2-4-2 雙相退火區對低錳鋼的影響 10
2-4-3 麻田散鐵之逆轉變 12
2-5 TRIP鋼之變型行為與機械性質 12
2-5-1 硬度 13
2-5-2 降伏強度與抗拉強度 13
第三章 研究目的 16
第四章 實驗方法 17
4-1 實驗材料 17
4-2 熱處理製程 17
4-3 機械性質 17
4-4 掃描式電子顯微鏡 18
4-5 X-ray繞射分析 18
4-6 背向式散射電子繞射分析與試片製作 18
4-7 X光成份分析系統(EDS)分析 19
第五章 實驗結果 20
5-1 顯微組織 20
5-1-1 熱軋板之顯微組織 20
5-1-2 退火後熱軋板之組織 21
5-1-3 冷軋板之顯微組織 21
5-1-4 兩相區退火之顯微組織 22
5-2 機械性質 23
5-3 相分率之組成 24
5-4 拉伸行為之顯微組織 26
5-5 化學成份 27
第六章 討論 28
6-1 顯微組織演化 28
6-2 機械性質 29
6-3 化學成份 31
第七章 結論 32
參考文獻 33
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