CAJ | 학술논문

建立了15SiMn钢奥氏体一铁素体相变的二维元胞自动机介观模型.模拟结果显示,对于某一给定温度,铁索体的长大速度在相变过程中逐渐降低.当生长速度接近0时,奥氏体相中相界面处平衡碳的质量分数为0.523 95%.此外,模拟结果还显示,由于奥氏体晶界上的碳原子扩散和奥氏体-铁素体相界面移动都较奥氏体晶内更快,所以奥氏体晶界上铁素体晶粒形貌为椭圆形.
건립료15SiMn강오씨체일철소체상변적이유원포자동궤개관모형.모의결과현시,대우모일급정온도,철색체적장대속도재상변과정중축점강저.당생장속도접근0시,오씨체상중상계면처평형탄적질량분수위0.523 95%.차외,모의결과환현시,유우오씨체정계상적탄원자확산화오씨체-철소체상계면이동도교오씨체정내경쾌,소이오씨체정계상철소체정립형모위타원형.
A two-dimensional meso-scale cellular au-tomaton model was developed to simulate the transfor-mation of austenite to ferrite in 15SiMn steel. The simulated results show that, at a given isothermal temperature, the average growth rate of ferrite is de-creased gradually during the austenite transformation. With the ferrite growth rate decreasing to zero, the carbon concentration in the austenite at the interface reaches equilibrium carbon concentration ot 0.52395%. In addition, the morphology of ferrite grains on austenite boundary exhibits ellipsoidal, which is attributed to carbon diffusion and movement of austenite-ferrite interface higher in the austenite boundaries than that in austenite interiors.