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OALib Journal期刊
ISSN: 2333-9721
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低碳钢焊缝中心凝固相组织的元胞自动机法模拟*
Keywords: 金属材料,焊接熔池,元胞自动机,溶质浓度,相组织
Abstract:
？基于元胞自动机法扩展了现有的焊接熔池凝固过程形核、生长及溶质扩散模拟模型,模拟了fe-0.05%c二元合金焊接过程中枝晶的生长形态和结晶过程中溶质的分布及扩散过程。同时,以fe-c二元相图为基点,根据溶质浓度不同相组织不同原理模拟计算了焊接熔池凝固后相组织的分布,建立了α+p和p+fe3cⅱ两种组织比例值与溶质浓度、冷却速度和形核基底数等参数的数学模型。结果表明:模拟得到的低碳钢焊缝组织分布与试验结果相符;基于溶质浓度变化的相组织控制模型能预测实际低碳钢的焊后焊缝组织。溶质浓度、冷却速度和形核基底数对α+p和p+fe3cⅱ两种组织比例的影响都较为明显,影响效果相对独立;回归分析得到的组织控制方程高度显著,为焊缝的组织控制提供了一定的数据支持。
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