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用X射线衍射,选区电子衍射和σ及δ相与马氏体基体之间的取向关系,鉴别了13Ni(280kgf/mm~2)马氏体时效钢的析出物。13Ni(280kgf/mm~2)马氏体时效钢强化析出物是金属间化合物δ-(Fe,Ni,Co)Mo。锻造状态时效后还析出μ相使韧性恶化。过时效后(例如580℃16h空冷)形成逆转变奥氏体。时效状态样品在电子显微镜里加热至743℃时,发现粗大的δ相颗粒和长条状的σ相颗粒。虽然衍射花样常常可以指标化成δ或σ相,但根据δ/α和σ/α之间取向关系的差别很容易区分δ和σ相。
The precipitates of 13Ni (280kgf / mm ~ 2) martensitic steel were identified by X-ray diffraction, selected area electron diffraction and orientation relationship between σ and δ phases and martensite matrix. 13Ni (280kgf / mm ~ 2) martensitic steel strengthening precipitation is the intermetallic compound δ- (Fe, Ni, Co) Mo. The forging state aging also precipitates the μ phase to deteriorate the toughness. After aging (eg 580 ℃ 16h air cooling) to form reverse transformation austenite. The aged sample was heated to 743 ° C in an electron microscope to find coarse δ-phase particles and long-length σ-phase particles. Although diffraction patterns can often be indexed to delta or sigma, the delta and sigma phases can be easily distinguished based on the difference in the orientation relationship between [delta] / [alpha] and [sigma] / [alpha].