【摘要】 金属固态相变被简单区分为切变型、扩散型两类,难免引起质疑甚至混乱。建议按照J．W．Christian的意见,将多型性转变、块形转变、晶粒长大、再结晶等化学成分不变的相变从扩散型相变中分离出来,单列为界面过程控制类。钢中硅、铬等元素微观分布不均匀性对过冷奥氏体恒温转变孕育期内贫碳区的形成有一定影响．应与晶体缺陷的影响共同考虑。以母相、新生相的成分-自由焓曲线为主体的热力学分析示意图,是根据热力学基本定律导出的规律作出的,不宜反过来用它说明原始规律,也不应用它作为分析问题的主要论据,更不应随意添枝加叶,令人莫测高深。更多还原

【Abstract】 Metal solid transformation is simply classified into shear and diffusion type, which would lead to doubt and e-ven confusion. According to Christians suggestions, the phase transformation of chemical composition invariant, such as polymorphous transformation, massive transformation, grain growth and recrystallization, should be separated from the diffusion type of phase transformation, and into that of rate - controlled by processes. The microscopic distribution asymmetry of the elements in steels such as Si, Cr and etc. , have certain effects on the formation of carbon - depleted zone during isothermal transformation of the supercooled austenite in the incubation period, and such effects should be considered together with the effects of crystal defect. The thermodynamics analysis sketch map ( parent phase and product phase composition -free energy curve) is deduced from the fundamental laws of thermodynamics, should not be taken to explain the original regulation and taken as the primary argument to analyze the problems, and append much confused trivialness.更多还原