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NiCrFe焊缝金属的晶界形貌和晶界MC碳化物对局部变形行为的影响
Alternative TitleEffect of Grain Boundary Morphology and MC on Plastic Deformation Behavior of NiCrFe Weld Metal: Crystal Plasticity Finite Element Analysis
周辉1; 王培1; 陆善平1
2019
Source Publication材料研究学报
ISSN1005-3093
Volume33.0Issue:011Pages:801-808
Abstract采用晶体塑性有限元方法研究了NiCrFe焊缝金属中晶界形貌和晶界MC碳化物对局部变形行为的影响。结果表明,试样中的弯曲晶界促进其周围基体中滑移系的开动,进而促进塑性变形均匀分布。由于晶界碳化物MC与基体的临界分剪切应力和硬化行为的差异显著,碳化物承担较高的应力而发生较小的塑性变形。碳化物与基体界面处不连续的应力分布加剧了二者变形的不协调性,使裂纹在MC与基体界面处萌生。焊缝金属中的弯曲晶界和晶界碳化物MC,对高温失塑裂纹的作用相反。为了降低高温失塑的影响,在工程实践中应该在尽量减少MC的情况下得到弯曲晶界。
Other AbstractEffect of grain boundary morphology and carbide precipitate on local heterogeneous plastic deformation of a NiCrFe weld metal were investigated by the crystal plasticity finite element method.Results show that the plastic deformation behavior is more homogeneous for the sample with tortuous grain boundaries rather than those with straight grain boundaries, since the tortuous grain boundary can promote the activation of slip systems around it more easily. Owning to the significant differences in the critical resolved shear stress and hardening behavior between the MC carbide and matrix, the carbide has much higher stress and lower strain compared with the matrix. The discontinuous stress distribution at the interface between the carbide and matrix may induce fracture initiation during the deformation. The tortuous grain boundaries and MC precipitates have the opposite effect on the ductility, dipping and cracking of the weld metal. Therefore, it should be tried to obtain the weld metal with tortuous grain boundaries while minimizing MC precipitates for engineering application.
Keyword金属材料 高温失塑裂纹 晶体塑性 晶界形态 MC
Indexed ByCSCD
Language中文
CSCD IDCSCD:6617555
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/154320
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.中国科学技术大学
Recommended Citation
GB/T 7714
周辉,王培,陆善平. NiCrFe焊缝金属的晶界形貌和晶界MC碳化物对局部变形行为的影响[J]. 材料研究学报,2019,33.0(011):801-808.
APA 周辉,王培,&陆善平.(2019).NiCrFe焊缝金属的晶界形貌和晶界MC碳化物对局部变形行为的影响.材料研究学报,33.0(011),801-808.
MLA 周辉,et al."NiCrFe焊缝金属的晶界形貌和晶界MC碳化物对局部变形行为的影响".材料研究学报 33.0.011(2019):801-808.
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