熱壓316L/Q345R復合板的結合性能

秦勤; 鄧俊超; 臧勇; 謝璐; 朱學輝

doi:10.13374/j.issn2095-9389.2018.04.010

熱壓316L/Q345R復合板的結合性能

doi: 10.13374/j.issn2095-9389.2018.04.010

北京科技大學機械工程學院, 北京 100083

基金項目:

國家自然科學基金資助項目(51375041)

詳細信息

中圖分類號: TG335.5⁺9
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出版歷程
- 收稿日期: 2018-01-18

Factors influencing the combined performance of hot-rolled bimetallic composite plates prepared via hot compression

School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 熱軋雙金屬復合板由于其優良性質而得到廣泛使用,而如何改善其結合性能也成為業界內的研究熱點問題.本文嘗試采用分子動力學模擬的方法對316L/Q345R雙金屬板的高溫結合性能進行系統研究.在建立316L/Q345R體系的原子結構模型的基礎上,使用MD模擬方法對316L/Q345R體系的熱壓復合過程進行模擬,其中采用嵌入原子勢函數來描述Fe、Cr和Ni之間的相互作用.分析了不同溫度與壓縮應變率對熱壓復合變形機制以及擴散層厚度的影響,并探討了添加金屬層對界面結合性能的改善效果.研究表明:溫度的提高有利于形成較厚的擴散層,當雙金屬熱壓復合溫度接近熔點時,此時在雙金屬復合界面獲得的擴散層厚度遠大于在較低溫度復合時的擴散層厚度;應變率的提高會降低擴散層厚度,這主要因為在達到相同的壓縮應變時,隨著應變率增大和壓縮時間縮短,原子的擴散時間縮短;在雙金屬之間添加一個晶格厚度的Ni層后,復合界面擴散層厚度比不含Ni復合時增加了134.5%,表明添加鎳層能夠明顯提高擴散層厚度,但添加鉻層對提高擴散層厚度的影響不大.
- 復合板 /
- 界面 /
- 結合性能 /
- 分子動力學 /
- 熱壓復合
Abstract: Hot-rolled bimetallic composite plates are widely used because of their excellent properties. In the recent years, the enhancement of the combined performance of hot-rolled bimetallic composite plates has gained the attention of the industry. The molecular dynamics simulations were employed to assess the high-temperature combined performance of 316L/Q345R bimetallic plate systematically. The hot-compression process of the 316L/Q345R system was simulated on its atom structure model. The potential functions of the embedded-atom method were employed to describe the interaction between Fe, Cr, and Ni. The effects of temperature and compressive strain rate on the mechanism of the hot-compression deformation and the thickness of the diffusion layer were analyzed. The influence of adding a metal layer on the interface bonding performance was also discussed. The results show that increasing the temperature up to the composite melting point leads to the formation of a thicker diffusion layer at the bimetallic interface. However, an increase in the strain rate reduces the thickness of the diffusion layer, because the diffusion and compression time of the atoms shortens as the strain rate increases. The influence of the addition of a Ni or a Cr layer on the combined performance was investigated. The thickness of the diffusion layer of the bimetallic interface was increased by 134.5% when a lattice thickness Ni layer was added in the bimetallic interface; however, the addition of a Cr layer did not improve the combined performance. This study provides new insight into the factors that directly influence the performance of hot-rolled bimetallic composite plates.
- composite board /
- interface /
- combined performance /
- molecular dynamics /
- hot compression

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