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在CMT增材制造工艺过程中对Mg-Gd-Y-Zn-Zr合金中的温度和应力场进行模拟研究

Mingkun Zhao¹, Zhanyong Zhao¹, Wenbo Du²

¹School of Materials Science and Engineering, North University of China, Taiyuan 030051, China.

Materials (Basel, Switzerland)

|March 13, 2024

概括

研究人员优化了热源,用于使用冷金属转移 (CMT) 增材制造Mg-Gd-Y-Zn-Zr合金. 最佳的速度最大限度地减少热积累和残余应力,提高材料的性能.

科学领域:

材料科学材料科学材料科学
制造业工程制造工程
金工业是一种金工业.

背景情况:

合金的增材制造 (AM) 在控制热谱和残余应力方面存在挑战.
冷金属转移 (CMT) 是一种有前途的弧工艺,用于AM应用,但需要优化热源参数.
Mg-Gd-Y-Zn-Zr合金对轻量化结构应用有兴趣,要求精确加工以获得最佳性能.

研究的目的:

开发和分析一种新的热源组合,用于CMT线弧添加剂制造Mg-Gd-Y-Zn-Zr合金.
研究工艺参数对温度分布和残余应力的影响.
为了将微观结构特征和机械性能与过程诱导的应力相关联.

主要方法:

开发混合热源模型,结合均体和倾斜的双圆形热源.
有限元分析 (FEA) 模拟用于预测温度场和应力分布.
使用电子反射衍射 (EBSD) 和微硬度测试进行实验验证.

主要成果:

确定了8m/min和8mm/s的最佳料和接速度,最大限度地减少热积累和残余应力.
发现Z轴余应力是主要的应力组成部分.
EBSD揭示了薄弱的纹理,而KAM分析表明第1层的残余应力最高,第11层的应力比第6层更高.
微硬度变化与残余应力和脱位密度相关,较高的应力导致微硬度增加.

结论:

开发的热源组合和优化参数有效控制Mg-Gd-Y-Zn-Zr合金CMT AM中的热积累和残余应力.
其余应力显著影响制造组件的微观结构和微硬度.
模拟结果与实验结果具有很高的一致性,验证了模型的预测能力.

关键词:

冷金属转移冷金属转移是什么意思综合热源热源的使用稀土是一种稀土.剩余压力是一种残留压力.模拟模拟是指一个模拟模拟.

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