卜善飞,姜芙林,魏长生,张耀辉,杨发展,梁鹏.Nb-Ti含量对FeCoNiCrNbxTiy高熵合金熔覆层韧脆转变与耐腐蚀性能影响研究[J].表面技术,2024,53(20):118-133.
BU Shanfei,JIANG Fulin,WEI Changsheng,ZHANG Yaohui,YANG Fazhan,LIANG Peng.#$NPEffect of Nb-Ti Content on Ductile-brittle Transition and Corrosion Resistance of FeCoNiCrNbxTiy High Entropy Alloy Cladding Layer[J].Surface Technology,2024,53(20):118-133 |
| Nb-Ti含量对FeCoNiCrNbxTiy高熵合金熔覆层韧脆转变与耐腐蚀性能影响研究 |
| #$NPEffect of Nb-Ti Content on Ductile-brittle Transition and Corrosion Resistance of FeCoNiCrNbxTiy High Entropy Alloy Cladding Layer |
| 投稿时间：2023-10-28 修订日期：2023-12-26 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.20.010 |
| 中文关键词: 高熵合金 激光熔覆 第一性原理计算 拉伸性能 耐腐蚀性 |
| 英文关键词:high-entropy alloy laser cladding first principles calculation tensile property corrosion resistance |
| 基金项目:山东省自然科学基金(ZR2022MEE081，ZR2021ME198);山东省主要农作物机械化生产装备协同创新中心开放课题项目(SDXTZX-21);高等学校学科创新引智计划(D21017) |
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| Author | Institution |
| BU Shanfei | School of Mechanical and Automotive Engineering,Shandong Qingdao 266520, China ;Key Laboratory of Industrial Fluid Energy Saving and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao 266520, China |
| JIANG Fulin | School of Mechanical and Automotive Engineering,Shandong Qingdao 266520, China ;Key Laboratory of Industrial Fluid Energy Saving and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao 266520, China;Collaborative Innovation Center for Mechanized Production Equipment of Major Crops in Shandong Province, Shandong Qingdao 266109, China |
| WEI Changsheng | School of Mechanical and Automotive Engineering,Shandong Qingdao 266520, China ;School of Mechanical and Automotive Engineering,Shandong Qingdao 266520, China |
| ZHANG Yaohui | School of Mechanical and Automotive Engineering,Shandong Qingdao 266520, China ;Key Laboratory of Industrial Fluid Energy Saving and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao 266520, China |
| YANG Fazhan | School of Mechanical and Automotive Engineering,Shandong Qingdao 266520, China ;Key Laboratory of Industrial Fluid Energy Saving and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao 266520, China;Collaborative Innovation Center for Mechanized Production Equipment of Major Crops in Shandong Province, Shandong Qingdao 266109, China |
| LIANG Peng | School of Mechanical and Automotive Engineering,Shandong Qingdao 266520, China |
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| 中文摘要: |
| 目的 针对海工装备承载件工作时因耐腐性及强韧性不足而发生失效的问题，研究了元素含量对高熵合金熔覆层塑脆性转变与耐腐蚀性能的影响规律和作用机理。方法 首先，在确定FeCoNiCrNbTi高熵合金体系的前提下，利用第一性原理计算方法对元素配比进行筛选，其次采用激光熔覆技术在典型海工装备材料42CrMo钢表面制备FeCoNiCrNbxTiy高熵合金熔覆层，以探究Nb、Ti元素含量对高熵合金熔覆层韧脆转变与耐腐蚀性能的影响规律与机理。结果 通过第一性原理计算得出FeCoNiCrNbTi高熵合金FCC相和BCC相的晶格常数均随着Ti含量的上升而下降，且这种下降趋势逐渐减缓;在涂层的物相中熔覆层主要由FCC相、BCC相以及Laves相组成，随着Nb含量的增加，Laves相衍射峰增强，而随着Ti含量的增加，BCC相衍射峰增强，Laves相中出现含Ti的化合物，并且组织中出现富Ti区;随着Nb与Ti含量的增加，熔覆层硬度均呈现上升趋势，但其抗拉强度及延伸率均呈下降趋势，并且当Nb元素含量与Ti元素的原子比分别增加至0.3和0.5时，其断裂方式实现由韧性断裂到脆性断裂的转变;随着Nb与Ti含量的增加，其耐腐蚀性因组织结构分布不均以及缺陷的产生而逐渐变差。结论 物相占比以及组织结构的分布是影响高熵合金熔覆层力学性能、断裂方式和耐腐蚀性的主要因素。在FeCoNiCrNbTi高熵合金中，BCC相及Laves相的增加均有利于显微硬度的提升，但会导致抗拉强度和延伸率变差，甚至发生韧脆转变;而且多种物相的生成破坏了组织成分的均匀性，甚至产生裂纹等缺陷，成为耐腐蚀性变差的主导因素。 |
| 英文摘要: |
| The work aims to study effect of element content on the plastic-brittle transition and corrosion resistance of high-entropy alloy cladding layers, so as to solve the failure of marine equipment bearing parts due to insufficient corrosion resistance and strength and toughness during operation. Firstly, on the premise of using FeCoNiCrNbTi high-entropy alloy system to modify the surface of marine equipment such as ship stern shaft, the element ratio of the high-entropy alloy system was further screened and evaluated according to the first-principles calculation method. The element ratio range of FeCoNiCrNbTi high-entropy alloy was determined. Then, FeCoNiCrNbTi high-entropy alloy was cladded on the surface of typical marine equipment material 42CrMo steel by laser cladding technology to form an FeCoNiCrNbxTiy high-entropy alloy cladding layer to explore the influence law and mechanism of Nb and Ti content on the ductile-brittle transition and corrosion resistance of the FeCoNiCrNbTi high-entropy alloy cladding layer. The results showed that the lattice constants of FCC phase and BCC phase of FeCoNiCrNbTi high entropy alloy decreased with the increase of Ti content, and the decreasing trend gradually slowed down with the increase of Ti content. Through XRD test, it was found that the cladding layer in the phase of the coating was mainly composed of FCC phase, BCC phase and Laves phase. In the cladding layer of the high entropy alloy, with the increase of Nb content, the Laves phase diffraction peak in the cladding layer showed an increasing trend. With the increase of Ti, the BCC phase diffraction peak in the cladding layer showed an increasing trend. It was worth noting that Ti-containing compounds also appeared in the Laves phase. Combined with the scanning electron microscope, it was found that Ti-rich regions also appeared in the FeCoNiCrNbTi high-entropy alloy cladding layer; In the hardness test of FeCoNiCrNbTi high entropy alloy cladding layer, it was found that with the increase of Nb and Ti content, the hardness of FeCoNiCrNbTi high entropy alloy cladding layer showed an upward trend. However, in the tensile test of FeCoNiCrNbTi high entropy alloy cladding layer, it was found that the tensile strength and elongation decreased with the increase of Nb and Ti content. The fracture morphology of high entropy alloy cladding layer was observed by scanning electron microscope. It was found that when the content of Nb element and Ti element increased to 0.3 and 0.5 respectively, the fracture mode changed from ductile fracture to brittle fracture. In the electrochemical corrosion test, it was found that in the FeCoNiCrNbTi high-entropy alloy cladding layer, with the increase of Nb and Ti content, the corrosion resistance gradually deteriorated due to the uneven distribution of the microstructure and the generation of defects. Through the analysis of the above results, it can be concluded that, the proportion of phase and the distribution of microstructure are the main factors affecting the mechanical properties, fracture mode and corrosion resistance of high entropy alloy cladding layer. In FeCoNiCrNbTi high entropy alloy, the increase of BCC phase and Laves phase is conducive to the improvement of microhardness. However, it also leads to the deterioration of tensile strength and elongation, and even ductile-brittle transition. Moreover, the formation of various phases destroys the uniformity of the tissue composition, and even cracks and other defects become the dominant factors for the deterioration of corrosion resistance. |
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