臺灣博碩士論文加值系統

本論文研製之新型不銹鋼13Cr2Mo2Ni，欲將此材料應用螺絲製造業，針對其組織與硬度分析，研究適合加工的熱處理參數。
本實驗分為兩個部分，第一部分為固溶化熱處理，此階段顯微組織主要為基地相的麻田散鐵，以及δ肥粒鐵相，在1100℃持溫時間30分鐘內時，仍有富硼富鉬相未固溶回基地中；在1100℃~1200℃，固溶化溫度中，δ肥粒鐵相分率和固溶化溫度與持溫時間均呈現正相關，而肥粒鐵的比例則和硬度呈負相關。
第二部分，欲將不銹鋼軟化，施以640℃~790℃溫度的退火熱處理，發現在690℃以上時有M23C6與M23(C,B)6析出，當退火溫度740℃以上時在δ肥粒鐵相晶界處有Laves phase析出；除此之外在退火溫度740℃以上時來到了(α+γ)雙相區中，γ相和退火溫度與持溫時間呈現正相關，而γ相冷卻後形成麻田散鐵，使硬度提升，所以欲將13Cr2Ni2Mo不銹鋼退火軟化，應避免退火溫度超過(α+γ)雙相區溫度。

This study is focused on a 13Cr2Ni2Mo stainless steel use as screws manufacturing. We want to find the best heat treatment parameters for manufacturing, by analysising it’s microstructure and hardness.
The first part of my experiment is solid solution heat treatment.In this stage,the microstructure is martensite as a base phase with some δ ferrite phase. When temperature of solid solution heat treatment is 1100 ℃,and temperature holding time is less than 30 minutes, there is still B-rich Mo-rich phase undissolved back to base; The fraction of δ ferrite phases are positive related with temperature and holding time, but the fraction of the ferrite is negative related with hardness in 1100℃~ 1200℃.
The second part, we want to soften the stainless steel. So we anneal it by 640 ℃ ~ 790 ℃.We found that when annealing temperature higher than 690℃,there are M23C6 and M23 (C,B)6 precipitated.When temperature higher than 740℃,Laves phase is precipitated on δ ferrite grain boundaries. When the annealing temperature above 740 ℃ ,it comes to the (α + γ) two-phase region. γ phase is positive related with the annealing temperature and the annealing holding time. The γ-phase transform to martensite at room temperature, and martensite make hardness upgrade. So, to soften 13Cr2Ni2Mo stainless steel should avoid the annealing temperature exceeds (α + γ) two-phase zone.

謝誌 I
目錄 II
表目錄 IV
圖目錄 VI
中文摘要 1
英文摘要 2
第一章 前言 3
第二章 文獻回顧 5
2.1麻田散鐵不銹鋼特性及衍生族系 5
2.2麻田散鐵相轉變 7
2.3合金成份的影響 8
2.4鎳、鉻當量與相圖的關係 11
2.5晶粒尺寸與機械性質關係 15
2.6固溶化熱處理與δ肥粒鐵相的影響 16
2.7 SMSS中逆變沃斯田鐵的影響 19
2.8碳化物種類與退火溫度的關係 21
2.9 Laves phase 25
第三章 實驗方法 27
3.1試片製備 27
3.2固溶化熱處理 29
3.3退火熱處理 29
3.4金相觀察 30
3.5相分率計算 31
3.6磁性測量 31
3.7 SEM觀察和EDS微成分分析 32
3.8 XRD分析 34
3.9硬度分析 35
第四章結果與討論 39
4.1固溶化處理對顯微組織與機械性質之關係 39
4.2固溶化處理溫度/時間對硬度之影響 53
4.3退火熱處理與析出相之關係 60
4.4退火熱處理與硬度之關係 83
第五章 結論 90
參考文獻 92

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