| 王艺飞,陈静远,张昭.基于晶粒形貌的增材制造力学行为数值模拟[J].计算力学学报,2024,41(5):837~842 |
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| 基于晶粒形貌的增材制造力学行为数值模拟 |
| Numerical simulation method for anisotropic mechanical behavior based on dislocation dynamics |
| 投稿时间：2023-10-12 修订日期：2023-12-18 |
| DOI：10.7511/jslx20231012001 |
| 中文关键词: 电弧增材制造 位错动力学 蒙特卡洛模型 晶体塑性模型 力学性能 |
| 英文关键词:wire arc additive manufacturing dislocation dynamics Monte Carlo model crystal plasticity model mechanical properties |
| 基金项目:国家自然科学基金(12372191;52332012);国家重点研发计划(2022YFB4600902)资助项目. |
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| 中文摘要: |
| 为了研究电弧增材制造中材料的各向异性力学行为,本文建立了双椭球热源模拟电弧增材制造过程中的温度场,建立Monte Carlo模型模拟增材层截面微观组织的变化,建立晶体塑性模型表征晶粒形貌对材料力学行为的影响规律,从而修正位错动力学模型,得到基于晶粒形貌特征的电弧增材制造中各向异性的力学行为数值模拟方法。修正后的位错动力学模型可以很好地反映出电弧增材制造工艺特征导致的材料各向异性行为,且与试验结果一致。电弧增材制造构件在增材高度方向上的力学性能显著低于热源移动方向的力学性能,在增材高度方向上和热源移动方向上晶粒尺寸比达到7.5 mm/1.3 mm时,屈服强度比达到787.8 MPa/865.2 MPa。钛合金在600℃以上出现明显的材料软化,这主要是晶粒球化导致的。 |
| 英文摘要: |
| In order to study the anisotropic mechanical behavior of materials in wire arc additive manufacturing (WAAM),the temperature field during the wire arc additive manufacturing process is simulated using a double ellipsoid heat source model in this paper.A Monte Carlo model is established to simulate the microstructural changes in the additive layer.A crystal plasticity model is employed to characterize the influence of grain morphology on the mechanical behavior,which is used to form modified dislocation density model revealing the anisotropic mechanical behavior based on grain morphology in WAAM.The obtained results are consistent with experimental data.The mechanical performance of WAAM components in the build height direction is significantly lower than arc scanning direction.When the ratio of grain size between the build height direction and the arc scanning direction reaches 7.5 mm/1.3 mm,the yield strength ratio reaches 787.8MPa/865.2 MPa.Titanium alloys exhibit obvious material softening at temperatures above 600 ℃ due to grain spheroidization. |
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