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至今文献都认为,在马氏体时效钢中应避免有孪晶马氏体,否则对塑韧性不利。本文用透射电镜对Cr12Mn5Ni4Mo3Al沉淀硬化不锈钢的研究表明,尽管它的机械性能与PH15-7Mo钢相当,但却存在一定数量的孪晶马氏体和位错马氏体中的块状孪晶。研究指出,由于在正常时效工艺条件下沿孪晶界析出的M_(23)C_6高度弥散,并产生共格形成的逆转变奥氏体,因此在本合金中一定量的孪晶马氏体并不影响合金的综合性能。电子衍射、X线衍射和化学分析指出,本合金是多相强化的复杂结构,主要强化相有:Laves相、σ相、M_(23)C_6、a’和a“相。a’和a”相都是体心立方结构,点阵常数相近,与基体完全共格,这是本合金中发现的两种新相。
Literature so far that in the martensite steel should avoid twinning martensite, plastic or toughness otherwise adverse. In this paper, transmission electron microscopy of Cr12Mn5Ni4Mo3Al precipitation hardened stainless steel research shows that despite its mechanical properties and PH15-7Mo steel considerable, but there are a certain number of twinned martensitic and dislocation martensite twin. It is pointed out that due to the high dispersion of M_ (23) C_6 precipitated along the twin boundaries under normal aging conditions and the formation of coherently formed retrograde austenite, a certain amount of twinned martensite Does not affect the overall performance of the alloy. Electron diffraction, X-ray diffraction and chemical analysis indicated that the alloy is a complex structure of multi-phase strengthening. The main strengthening phases are Laves phase, σ phase, M_ (23) C_6, a ’and a “phase. ”Phase are the body-centered cubic structure, the lattice constant is similar to the complete coherence with the matrix, which is the alloy found in the two new phases.