本研究主要針對鐵-20錳-6鋁-4鎳-3鉻-0.5碳合金進行顯微組織分析。其結果顯示:當合金經1050℃在大氣環境下持溫60分鐘固溶處理,其基地為單相沃斯田鐵相及晶粒會有雙晶結構產生。若將合金經550℃時效處理,其基地有κ相,晶粒邊界可發現B2+Cr7C3析出物的產生,為[011]軸,κ相晶格常數為a=0.377nm,Cr7C3碳化物晶格常數為a=1.385nm,c=0.448nm,B2晶格常數a=0.286nm。合金經650℃及750℃時效處理,晶粒邊界可發現有B2+Cr7C3的析出物產生。當合金經850℃並持溫30分鐘~8小時之時效處理,則晶粒邊界κ相結構。 關鍵字:鐵鋁錳鎳鉻碳合金、相變化、Cr7C3碳化物、B2
The main purposes of the present studies are to investigate the phase transformation of the Fe-20Mn-6Al-4Ni-3Cr-0.5C Alloy. The results show: when the alloy in atmosphere at 1050 ℃ for 60 minutes under the holding solution treatment temperature,grain production will be double-metal structure. When the alloy is heated to temperature of 450 ℃ and hold 4 to 72 hours of aging treatment, the crystal structure of a double. If the alloy and the holding temperature of 550℃/2 ~ 180 hours aging, the base is a k-phase produced a B2 + Cr7C3 grain boundary precipitates, as [011] axis lattice constants are a = 0.377nm, Cr7C3 lattice constants a = 1.385nm, c=0.448nm, B2 lattice constants a = 0.286nm, Alloy and 750 ℃ and 30 minutes to 16 hours of aging, there are grain boundary precipitates B2 + Cr7C3 generated. When the alloy and at 850 ℃ and 30 minutes to 8 hours of aging, κ is the grain boundary phase. Keyword:Fe-Al-Mn-Ni-Cr-C alloy, Phase Transformation, Cr7C3 carbides, B2