Research on the behaviour and mechanism of void welding based on multiple scales

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

High Temperature Materials and Processes Pub Date : 2023-01-01 DOI:10.1515/htmp-2022-0271

Ruxing Shi, Xingsheng Yu, Huiqin Chen, Y. Jiao, Juan Chen, Fei Chen, Sizhe He

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引用次数: 1

Abstract

Abstract As the core foundation of major national equipment, large forgings have a great influence on the national economic construction, the development of national defence equipment and the development of modern cutting-edge science and technology. In the production of large forgings, welding the internal void of forgings is a technical problem that directly affects the quality of large forgings. In view of the phenomenon of void welding in large forgings, the behaviour and mechanism of void welding were deeply studied based on the stretching test and molecular dynamics simulation, combined with a lot of theoretical analysis. The results show that multi-pass stretching deformation is a kind of plastic deformation process which can eliminate void defects. When the forging ratio reaches 2.2, the void can be welded completely and the tensile strength can be restored to the level of the matrix. With the increase of compression deformation, the stress will increase sharply, especially at the grain boundary. In addition, the main void welding mechanism of 30Cr2Ni4MoV steel is the recrystallization and grain growth mechanism. Recrystallization and grain growth are of great significance for promoting the reduction of void volume and realizing metallurgical bonding of the interface.

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基于多尺度的空洞焊接行为与机理研究

摘要大型锻件作为国家重大装备的核心基础，对国民经济建设、国防装备发展和现代尖端科学技术的发展有着重要影响。在大型锻件生产中，锻件内部空隙的焊接是一个直接影响大型锻件质量的技术问题。针对大型锻件中的气孔焊接现象，在拉伸试验和分子动力学模拟的基础上，结合大量理论分析，深入研究了气孔焊接的行为和机理。结果表明，多道次拉伸变形是一种可以消除孔隙缺陷的塑性变形过程。当锻造比达到2.2时，孔隙可以完全焊接，抗拉强度可以恢复到基体的水平。随着压缩变形的增加，应力将急剧增加，尤其是在晶界处。此外，30Cr2Ni4MoV钢的主要气孔焊接机制是再结晶和晶粒长大机制。再结晶和晶粒生长对于促进空隙体积的减小和实现界面的冶金结合具有重要意义。

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来源期刊

High Temperature Materials and Processes 工程技术-材料科学：综合

CiteScore

2.50

自引率

0.00%

发文量

审稿时长

3.9 months

期刊介绍： High Temperature Materials and Processes offers an international publication forum for new ideas, insights and results related to high-temperature materials and processes in science and technology. The journal publishes original research papers and short communications addressing topics at the forefront of high-temperature materials research including processing of various materials at high temperatures. Occasionally, reviews of a specific topic are included. The journal also publishes special issues featuring ongoing research programs as well as symposia of high-temperature materials and processes, and other related research activities. Emphasis is placed on the multi-disciplinary nature of high-temperature materials and processes for various materials in a variety of states. Such a nature of the journal will help readers who wish to become acquainted with related subjects by obtaining information of various aspects of high-temperature materials research. The increasing spread of information on these subjects will also help to shed light on relevant topics of high-temperature materials and processes outside of readers’ own core specialties.