Numerical study of the effect of carbide precipitation on the mechanical properties of ENiCrFe-3 pre-edge welded dissimilar steel welds
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摘要: 为避免异种钢焊接中的元素扩散富集现象,文中采用预边堆焊ENiCrFe-3过渡层的方法,实现了异种钢的良好焊接,但在焊接接头中发现了碳化物的析出现象,进而采用晶体塑性有限元方法,构建了晶界处添加碳化物的晶体塑性有限元分析模型. 模拟结果表明,碳化物析出相会对晶粒内部与晶界上的应力应变分布产生显著影响,由于碳化物含量增加,夹杂物的区域应力集中增大,三晶粒交点是焊缝力学性能最薄弱的区域,晶界交汇处应力分布不对称,通常最先失效,成为断裂源.Abstract: In order to avoid the phenomenon of element diffusion enrichment in the welding of dissimilar steels, this paper uses the method of pre-edge overlay welding ENiCrFe-3 transition layer to achieve a good weld of dissimilar steels, but the precipitation of carbide was found in the welded joint, and then the crystal plasticity finite element method was used to construct a crystal plasticity finite element analysis model with the addition of carbide at grain boundaries. Simulation results show that: carbide precipitation phase will have a significant effect on the stress-strain distribution within and on the grain boundaries, due to the increase in carbide content, the stress concentration increases in the region of inclusions, the three-grain intersection is the weakest region of the mechanical properties of the weld, and the stress distribution at the intersection of the grain boundaries of the three grains is asymmetric and usually the first to fail and become a source of fracture.
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Keywords:
- crystal plasticity /
- carbide /
- finite element /
- stress-strain
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表 1 基材取向分布
Table 1 Substrate orientation distribution
晶粒 φ1 φ φ2 C1 334.88 9.3562 83.897 C2 90.414 26.214 29.908 C3 134.89 133.50 240.20 C4 109.01 5.9288 325.66 C5 52.097 161.70 98.100 C6 358.65 152.61 84.727 C7 168.57 24.719 29.376 C8 196.05 0.1030 111.86 表 2 晶体塑性材料参数
Table 2 Crystal plastic material parameters
材料 C11 R1/GPa C12 R2/GPa C44 R3/GPa 参考应变率ε−1/s−1 初始硬化模量 R4/MPa 初始临界剪应力 R5/MPa 饱和应力 R6/MPa 自硬化系数 潜硬化系数 基体材料 311 153 79 0.001 250 60 240 0.2 0.2 碳化物材料 375 161 13 0.001 100 25 40 0.2 0.1 -
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