Numerical simulation of β to α phase transformation in heat affected zone during welding of TA15 alloy
Numerical simulation of β to α phase transformation in heat affected zone during welding of TA15 alloy
复制标题
TA15合金焊接热影响区β相到α相变的数值模拟
DOI：
10.1016/j.commatsci.2013.01.006
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发表时间：
2013-05
期刊：
影响因子：
--
通讯作者：
X.H. Zhan
中科院分区：
文献类型：
--
作者：
K.J. Song;Y.H. Wei;Z.B. Dong;X.H. Zhan
采用基于热力学和演化动力学分析的元胞自动机模型模拟了TA15合金热影响区（HAZ）焊接冷却时β相到α相的转变。在该模型中，定量表征了冷却速率对相变过冷度、溶液溶解度、成核速率以及与各向异性界面移动迁移率相关的晶体学特性的影响。模拟结果表明，随着冷却速率从0.6℃/s逐渐增大到1.5、5.0、16.7℃/s，由于过冷度和过饱和度较大，α相板生长得更细、更快，其中α相板的平均厚度为9.2、7.4、2.1、1.5μm，但由于相变时间较短，最终相变率降低，即33.8%、26.5%、10.3%、4.6%。在焊接参数不变的情况下，获得整个HAZ的温度场、晶粒尺寸分布、组织相和形貌。模型化的α相生长动力学和晶粒尺寸与实验进行了比较，证明是有效的，为焊接工艺、多尺度显微组织和力学性能的理论和实践一体化奠定了坚实的基础。
Cellular automaton model based on thermodynamic and evolution kinetic analysis was employed to simulate β to α phase transformation upon welding cooling in the heat affected zone (HAZ) of TA15 alloy. In this model, the effect of cooling rate on the phase transformation undercooling, solution solubility, nucleation rate as well as crystallographic characteristic related anisotropic interface moving mobility is quantitatively characterized. Simulation results indicate as the cooling rate increases from 0.6°C/s, then successively to 1.5, 5.0, 16.7°C/s, α phase plates grow finer and faster due to larger undercooling and degree of supersaturation, therein the according average thickness of α plates is 9.2, 7.4, 2.1, 1.5μm, but the final transformation percent decreases due to shorter transformation time, which is 33.8%, 26.5%, 10.3%, 4.6%. With welding parameters constant, the temperature field, grain size distribution, and constituent phase and morphology are acquired in the whole HAZ. The modeled α phase growth kinetics and grain size are compared with the experiments and proved to be effective, which lays a solid foundation for integration of welding process, multi-scaled microstructure and mechanical properties in both theory and practice.
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影响因子：
3.3
作者：
Sumitesh Das
通讯作者：
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影响因子：
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作者：
Nastac, L
通讯作者：
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影响因子：
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作者：
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DOI：
10.1146/annurev.ms.03.080173.001551
发表时间：
1973-08
期刊：
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1016/j.msea.2006.04.076
发表时间：
2006-07
影响因子：
6.4
作者：
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通讯作者：
R. Thiessen;I. Richardson;J. Sietsma