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文献[1]曾用相结构单元中最强共价键上的共价电子数n_A讨论了钢中的相变问题.本文仿文献[2]的方法进行计算,B-型杂化态下铸铁奥氏体和渗碳体晶胞中最强共价键上的共价电子数分别为n_A=0.9307和n_A=0.9385.余瑞璜先生已经给出石墨结构最强共价键上的共价电子数n_A=1.2051.按文献[1]的观点,铸铁凝固时最先结晶的相不应是石墨,且石墨结构中的n_A值为1.2051,平衡凝固时构成这样强的共价键驱动力源于何处?为回答这些问题,本文引入一个新参数——结构形成因子S,并用S对铸铁的凝固和石墨化进行了电子理论分析.
In [1], the phase transition problem in steel has been discussed with the number of covalent electrons n_A on the strongest covalent bond in the phase structure unit. The number of covalent electrons on the strongest covalent bond in austenite and cementite cells is n_A = 0.9307 and n_A = 0.9385, respectively. Mr. Rui Rui Huang has given the number of covalent electrons n_A on the strongest covalent bond of graphite structure = 1.2051. According to the literature [1], the first phase of cast iron solidified should not be graphite, and the n_A value in the graphite structure is 1.2051. Where is the driving force for the formation of such a strong covalent bond during equilibrium solidification? In order to answer these questions, we introduce a new parameter, the structural formation factor S, and conduct an electronic theoretical analysis of solidification and graphitization of cast iron with S.