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用内转换Mossbauer谱分析了Fe-Mn-Cr-C合金冷变形前后合金元素原子与碳原子的不均匀分布和相组成。发现该合金在固溶处理状态时为两类奥氏体,即无碳奥氏体和含碳奥氏体;经变形诱发出不含碳与合金元素的无碳马氏体(类α-Fe)及含碳与合金元素的合金马氏体。理论计算和试验证实:该合金中奥氏体向马氏体转变是受奥氏体晶胞内共价键中共用电子对的数目(n_A值)大小所控制。合金元素原子与碳原子之间形成结合力较强的C-M_e共价键,这对合金马氏体的形成具有强烈的阻碍作用。
The internal transformation Mossbauer spectrum was used to analyze the uneven distribution and phase composition of the alloying elements atoms and carbon atoms before and after cold deformation of Fe-Mn-Cr-C alloys. It is found that the alloy has two kinds of austenite, ie, carbon-free austenite and carbon-containing austenite in solution treatment. The carbon-free martensitic (α-Fe-like ) And alloys containing carbon and alloying martensite. Theoretical calculations and experiments confirm that the transformation of austenite to martensite in this alloy is controlled by the number of common electron pairs (n_A) in the intracellular covalent bond of austenite. The formation of C-M_e covalent bonds between alloying elemental atoms and carbon atoms strongly hinders the formation of martensite.