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to the residual segregation model and simulation results of DICTRA thermodynamic software, the homogenization temperature and time range were set as 1120–1170°C and 5–20 h, respectively. The experimental results......
枝晶形貌进形了比较,利用电子探针(EPMA)对元素的分布进行了定量分析,并使用Thermo-Calc软件中的Dictra模块进行了模拟验证.研究结果表明,退火工艺使20CrMnTi齿轮钢铸坯的枝晶形貌显示得更加完整清晰,测量退火后铸坯中的二次枝晶间距为55μm.铸坯中碳元素存在上坡扩散,偏析系数变大,偏析系数变化量?kC为0.666;硅元素存在轻微的上坡扩散,偏析系数变化量?kSi为0.041 5;锰元素扩散更加均匀,偏析系数变化量为?kMn为-0.141;铬元素扩散得更加均匀,偏析系数变化量为?kCr为-0.106.模拟结果显示,铸坯在保温温度为680℃,保温时间为2 h的退火工艺条件下,碳原子发生了上坡扩散,产生偏析现象;硅,铬,锰原子无明显扩散变化.关键词:20CrMnTi;枝晶间距;Dictra;均匀化;动力学;......
temperature in real time and length scale. The thermodynamic and mobility data were obtained from Thermo-Calc and DICTRA softwares, respectively. The results show that the volume fractions of α......
] ANDERSSON J O, HELANDER T, H?GLUND L. Thermo-Calc and Dictra, computational tools for materials science [J]. Calphad, 2002, 26: 273-311. (Edited by HE Xue-feng) Foundation item: Project (2006CB605202......
与合金的熔炼及结晶,偏析与均匀化,热处理中的相变,冷变形后的回复与再结晶等.此外许多钛合金热处理工艺及强化机制都会受到扩散过程的控制. 国内外学者对钛合金的扩散进行了较为系统的研究,Dictra的Mob2已经系统地包含了Ti-Al的扩散动力学数据库,LIU等[6]建立了相应的Ti-V扩散动力学数据库.THIBON等[7],LAIK等[8],PAVLINOV 等......
: 76-84. [16] HELANDER T, HOGLUND L, ANDERSON J O, SHI P F, SUNDMAN B, ANDERSON J O. Thermo-Calc & DICTRA, computational tools for materials science [J]. CALPHAD, 2002, 26(2): 273-312.  ......
. Application of Thermo-Calc to the development of high-performance steels [J]. J Phase Equilibria, 1999, 20(3): 231-237. [8]Andersson J O, Helander T, Hglund L, et al. Thermo-Calc & DICTRA......
Dictra符合较好.BENOIT等[4]对于近β钛合金中复杂的双相微观组织的溶解进行了相场模拟.对于颗粒溶解问题的研究方法还包括解析和其它数值方法[5],但只限于研究单个的形状简单的颗粒和多颗粒的均匀分布和对数正态分布.对于钛合金中α相溶解的研究只局限于单个颗粒及简单分布情况.对于钛合金中α相复杂的空间分布和初始颗粒不同尺寸分布下的溶解过程目前还未见报道.本文作者应用三维相场动力学方法研究......
and Composites. Limassol, Cyprus, 2004. [5] ANDERSSON J O, HELANDER T, HOGLUND L, SHI PF, SUNDMAN B. Thermo-Calc & DICTRA, computational tools for materials science [J]. Calphad, 2002, 26: 273-312. [6......
phase-field modeling to study α phase transformation in Ti-Al-V alloy, and found that the results agreed well with the DICTRA simulations. YAMANAKA et al [4] simulated the microstructural formation......