thermal barrier

The formulas for jump of specific heat at constant pressure and specific heat at constant volume which the surface tension is considered are given.

研究了表面张力随温度的变化对液气临界点相变时比热跃变的影响，得到了考虑表面张力随温度变化的影响时定压比热和定容比热跃变的新公式。

The nucleation is at boundary in bainite phase transformation which is the diffusive less γ→α transformation at carbon-poor area but shear process,and nucleation and growth by heat activation transition of interface substitution atoms.

指出了过渡性是贝氏体相变的主要特征;提出了贝氏体的新定义和贝氏体相变的新机制;贝氏体相变在晶界形核,晶核是单相贝氏体铁素体(BF),不是BF共析分解;在贫碳区形核,是贫碳的γ→α的无扩散相变,不是切变过程,而是以界面替换原子非协同热激活跃迁方式形核长大;钢中贝氏体碳化物(Bc)在γ/α相界面上形核,向BF中长大,最终被铁素体包围,也是以界面原子热激活跃迁方式进行的。

the difference is of the order of 3-4,that the diffusion-step mechanism was not valid,and atom heat activation transition mechanism of upper bainitic ferrite crystal nucleus growth was given.

另外,提出了上贝氏体铁素体晶核长大的原子热激活跃迁机制。