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SCM435中碳合金鋼淬火製程對機械性質及組織之影響 = The Eff...

國立高雄大學化學工程及材料工程學系碩士班

SCM435中碳合金鋼淬火製程對機械性質及組織之影響 = The Effects of Quenching Heat Treatment on the Microstructure and Mechanical Properties of SCM435 Medium Carbon Alloy Steel

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	The Effects of Quenching Heat Treatment on the Microstructure and Mechanical Properties of SCM435 Medium Carbon Alloy Steel
作者:	歐展志,
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:	2013[民102]
面頁冊數:	95面圖，表格 : 30公分;
標題:	淬火
標題:	Quench
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/71173065020888415026
附註:	參考書目：面81-84
附註:	102年10月31日公開
摘要註:	螺絲、螺帽的生產是屬於台灣出口貿易非常重要產品之一，這些產品使用的材質種類非常多從低碳鋼、中碳鋼、高碳鋼、低合金鋼，到不銹鋼以及鈦合金都有，其中中碳低合金鋼更是一些建築用扣件常使用的材質，中碳低合金鋼的扣件在加工時都會進行退火過程降低其強度以利於加工，退火的組織通常為波來鐵組織或球化組織，而這些組織的強度都不足支撐建築物，故在加工後會施於淬火、回火過程來提高強度。中碳合金鋼在淬火過程中的首要步驟就是將材料加溫至Ac3溫度以上保持一段時間使組織沃斯田鐵化(fcc結構)，在急速冷卻下來使組織轉變成麻田散鐵(bct結構)，本研究將SCM435材質的螺絲經由不同的沃斯田鐵化溫度淬火下來，再利用兩種不同的金相腐蝕技術來觀察其顯微結構，藉由OM、SEM、硬度試驗比較其差異性。研究結果得知，淬火溫度越高所形成的沃斯田鐵晶粒會越大，而大顆的沃斯田鐵晶粒所形成的板狀麻田散鐵束會越長，另一方面因為材質本身為球化組織在做沃斯田鐵化的階段會有部分碳化物無法分解溶入，導致了阻礙沃斯田鐵晶粒成長，故在高溫下淬火的沃斯田鐵晶粒呈現了大小混晶現象，在機械性質方面，符合Hall-Petch理論隨著沃斯田鐵晶粒越小，其硬度值會較高。 Screws and nuts are one of most important industrial export products in Taiwan. Those of them are made by many different types of steel, namely: mild steel, medium carbon steel, high carbon steel, low alloy steel, stainless steel and titanium. The fasteners of medium carbon low alloy steel are very common used in architectural materials. In the manufacturing procedures, medium carbon low alloy steel fasteners will be annealed, in order to reduce tensile strength and get better workability, and the phase structure after annealing are pearlite or spheroidized carbides. However, the strength of those structures are not stronger enough to support building structure, so those procedures will be quenched & tempered in order to enhance strength.During the process of quenching, the first step is to heat test samples up to Ac3 and then keep them for certain time in order to achieve homogenous austenite structure(fcc). After rapid cooling the structure becomes to martensite structured (bct). As experimental methods the SCM435screw will be quenched from different austenitizing temperatures and then via different metallographic etching techniques like OM, SEM and Hardness tested in order to observe the microstructure and its relationship with hardness as well.The test results show, that samples quenched from a higher temperature gets larger austenite grain size. A larger austenite grain leads to longer martensite plate packet after quenching. On the other hand, the spheroidized microstructure in austenite can't be decomposed and kept as carbide that hinders the growing of austenite grain. The mixed grain size in microstructure of quenched samples is the result in this study. Another study on mechanical properties show that the smaller the austenite grain size, the hardness value is higher that is according to the Hall-Petch equation.

SCM435中碳合金鋼淬火製程對機械性質及組織之影響 = The Effects of Quenching Heat Treatment on the Microstructure and Mechanical Properties of SCM435 Medium Carbon Alloy Steel
歐, 展志

SCM435中碳合金鋼淬火製程對機械性質及組織之影響 = The Effects of Quenching Heat Treatment on the Microstructure and Mechanical Properties of SCM435 Medium Carbon Alloy Steel / 歐展志撰 - [高雄市] : 撰者, 2013[民102]. - 95面 ; 圖，表格 ; 30公分.
參考書目：面81-84102年10月31日公開.
淬火Quench

SCM435中碳合金鋼淬火製程對機械性質及組織之影響 = The Effects of Quenching Heat Treatment on the Microstructure and Mechanical Properties of SCM435 Medium Carbon Alloy Steel
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