摘要
GTD 450屬於含銅之麻田散鐵析出硬化型不?袗?，其具有高強度與高延展性、耐蝕性也相當的高等之特殊性質，所以常被應用於化學、食品工業上和蒸氣渦輪機的壓縮零件等；本研究主要是針對榮鋼公司所提供之GTD 450不?袗?進行固溶與時效處理，利用穿透式電子顯微鏡(TEM)觀察其顯微組織。 由實驗結果顯示固溶處理試片所對應之顯微組織大部分為板條狀麻田散鐵內含少量微雙晶組織和殘留沃斯田鐵，510℃時效處理之硬度值比590℃時效處理高，且於過時效的情形下，590℃之時效硬度曲線下降趨勢較為快速；590℃時效處理有reversed沃斯田鐵產生，且隨著時間增加沃斯田鐵會增加，且其reversed沃斯田鐵與麻田散鐵間呈現Nishiyama-Wasserman方位關係。而在510℃時效處理並未觀察到reversed沃斯田鐵之生成，而其殘留沃斯田鐵與麻田散鐵間呈現Nishiyama-Wasserman方位關係。
並列摘要
The GTD 450 stainless steel is a kind of precipitation hardening martensitic stainless steel containing copper. This steel has been found to have numerous applications in the chemical and food industries, and for various compressor components in both gas and steam turbines due to its high strength, ductility and corrosion resistance. In this research, aging behavior has been investigated via optical metallopgraphy, transmission electron microscopy and micro-hardness measurement. The microstructure of solution treatment specimens is composed by lath martensite (with micro-twin) and retained austenite. The hardness of specimens which were aged at 510℃ is higher than the one aged at 590℃. In the over-aging case, the hardness curve of aged at 590℃ decreases faster than 510℃. In the case of 590℃ aging treatment, the reversed austenite has been formed, and the amount of reversed austenite increase with increasing time of aging treatment. The orientation relationship between the reversed austenite and the martensitic matrix has been determined to be [100]bcc//[110]fcc 、(011)bcc //(111)fcc ,which matches the Nishiyama-Wasserman relationship. In the case of aging at 510℃, the reversed austenite is not formed, but the orientation relationship between the retain austenite and the martensite is also N-W relationship.
參考文獻
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