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題 名 | Physical Metallurgy of Mechanically Alloyed Oxide Dispersion Strengthened MA956 and MA957 Stainless Steels(1):Recrystallisation Mechanism=氧化物分佈強化型機械合金MA956及MA957不鏽鋼之物理冶金(1)再結晶機構 |
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作 者 | 周棟勝; | 書刊名 | 材料科學 |
卷 期 | 26:4 1994.12[民83.12] |
頁 次 | 頁300-310 |
分類號 | 454.88 |
關鍵詞 | 機械合金; 儲存能; 集合組織; 方向性再結晶; 原子探針; Mechanical alloying; Stored energy; Texture; Directional recrystallisation; Atom probe; |
語 文 | 英文(English) |
中文摘要 | 本文探討氧化物分佈強化型機械合金MA956及MA957不鏽鋼之再結晶 影響因子。結果顯示,以機械合金製程所得到之鋼材具有超微細之晶粒組織及高 儲存能。雖然此類鋼材其有明顯之細小析出物排列,然而析出物對再結晶之阻礙 作用遠低於儲存能釋放所提供之趨動力。以單純之能量觀點,難以圓滿解釋再結 晶行為之差異與加工所造成之效應。事實上,再結晶乃受限於超微細晶界本身之 阻擋。而再結晶之趨動乃決定於有效晶核之形成,以克服此一能量障壁。在此, 集合組織具有決定性之影響。 |
英文摘要 | The factors which affect the recrystallisation behaviour of mechanically alloyed oxide dispersion strengthened MA956 and MA957 stainless steels have been investigated systematically. The microstructures prior to recrystallisation consist of incredibly fine grains which are in a heavily deformed state. This accounts for the large stored energy in the materials immediately after consolidation and extrusion. Although the material has significant alignment of yttria, the pinning force by dispersoids is far lessthan driving force provided by the release of stored energy in the as-received state. However, the using of stored energy concept shows difficult in interpreting the ultra-high recrystallisation temperature in the steel. Moreover, cold-deformation tends to decrease the recrystallisation temperature, but reduces the stored energy. In fact, the pinning by grain boundary junctions themselves retards the recrystallisation. The onset of recrystallisation is highly relied on the formation of critical nuclei to overcomethe free energy barrier thermodynamically, in which a strong textured sample with high percentage of low angle sub-micrometer grains clustering is beneficial to pursuing the sub grain coalescence, thusenhance the ease for recrystallisation. Remarkably, the level of stored energy has a much less pronounced influence on the onset of recrystallisation. |
本系統中英文摘要資訊取自各篇刊載內容。