• 作者： 劉忠仁
• 作者服務機構： 航空工業發展中心航空研究院
• 中文摘要： N-155 (AISI-661)是列屬於Fe-Ni基系的抗高溫合金，美國金屬協會(A.S.M)，則將其分類於Fe-Ni-Cr基系，因為此種合金在發展過程中，起源於沃斯田鐵不鐫鋼。後經不斷改進，使該合金適用於低應力及1100℃的溫度範圍以下。 N-155以沃斯田鐵－γ(f.c.c.）為基質，其強化機構（Strengthen Mechanism)，是以固溶體合金元素的強化效能，及次穩定沃斯田鐵(Metastable Austenite)，在M　溫度以下的轉化效應為基礎。該合金並不具有熱處理析出硬化的機構模式，故N-155再被分列於Fe-Ni基系中的第四大類。 就是由於固溶體強化及部份沃斯田鐵轉化的導引，使應變或冷作硬化(Strain or Cold WorkHardening)效應，對N-155之抗張強度、硬度、退火熱處理等，造成了極其重要的影響。本文即將針對此類問題，倣一系列之研討，以便對今後在加工成型的程序上，提出有效之實驗數據，進而改進生產成品品質。
• 英文摘要： N-155 is Nickel-iron base superalloy whichwas developed primarily from the stainless steeland utilized in low-stress applications to appro-ximately 1100℃. N-155 has an Austenitic matrix (f.c.c.－γphase) and its substantial strengthing can beobtained by the composite strengthening mecha-nisms which include solid solution hardening andthe metastable austenitic matrix deformed belowthe M temperature to produce α'-martensite.It can not be strengthened by solution treat-ment. Because there are no any γ'phase pre-cipitations happened. The investigation reported in the presentpaper extends the use of cold work (C.W.%)to correlate Y.S., U.T.S. elongation and hard-ness of N-155. From metallographic observa-tions to compare the extent of metastable auste-nitic transformations. Furthermore, Annealingtreatments of 16 min-30 min-1 hr duration weregiven in the range 900℃-1100℃ and the chan-ges in the mechanical properties were deter-mined. Fire sub-grained austenite structureswere the main reason to affect its Y.S. andflow stress, if using relatively shorter annealingtimes.
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