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2025年55卷第3期
Important Issuse
摘要：The working environment of aviation engines is extremely harsh, subject to high-temperature and high-pressure airflow, alternating mechanical loads with large changes in amplitude and frequency, thermal alternation, vibration, and foreign body strikes, etc., which are very prone to damage, and put forward an urgent demand for the new repair force. This paper firstly discusses the new repair force and its characteristics, and clarifies the urgent demand for the extreme remanufacturing of the overall performance consistency and longevity of the life of the heavy repair parts of the aviation engines under the limitations of process constraints, material constraints, structural constraints, cost constraints, and cycle constraints. Secondly, the principle and characteristics of extreme remanufacturing of aviation engine are clarified at the new stage. Finally, based on the type of extreme remanufacturing of aviation engine parts, parts failure rate and the application of extreme remanufacturing technology, the extreme remanufacturing for aviation engine technology system and the development status are sorted out. It points out the direction for the extreme remanufacturing technology and its development of aviation engines.关键词：aviation engine;repair;new repair force;extreme remanufacturing120|181|0更新时间：2025-03-28- 摘要：This study aims to address the challenges encountered in traditional forging and casting processes when working with TC4 titanium alloy for deep-sea equipment. The study employs Selective Laser Melting (SLM) technology for the fabrication of TC4 titanium alloy and conducts an in-depth investigation of its microstructure and mechanical properties. It was found that the TC4 titanium alloy prepared by SLM exhibits a needle-like α' martensitic structure, which is significantly different from the equiaxed grain structure of the traditional rolled state, and almost no β phase was detected in the SLM samples. The TC4 titanium alloy prepared by SLM demonstrated a nanohardness of 5.36 GPa, which is substantially higher than the 1.54 GPa of the traditionally rolled state. Moreover, it has a tensile strength of up to 1123.9 MPa and an elongation rate of 9.78%. Although the impact toughness is 43 J, slightly lower than the 59.5 J of the rolled TC4, it still meets the national standard requirements. This study indicates that the TC4 titanium alloy prepared by SLM technology not only meets the application standards for deep-sea equipment in terms of mechanical properties but also surpasses traditional materials in some aspects, playing a significant role in advancing the development of deep-sea equipment.关键词：selective laser melting (SLM);TC4 titanium alloy;microstructure;mechanical properties;deep-sea equipment30|2|0更新时间：2025-03-28
- 摘要：The passage reviews the impact of rare earth elements on the weld metal of low-alloy high-strength steel, including their effects on welding processibility and the microstructure and properties of the weld metal. It summarizes the role of rare earth elements in improving the processability of welding wires, electrodes, and fluxes, as well as their impact on inclusions and solid solutions in the weld metal. The paper also discusses the methods of introducing rare earth elements under different welding material preparation methods and the commonly used detection methods for rare earth elements in weld metal.Resultsindicate that rare earth elements can enhance the processability of welding wires, electrodes, and fluxes, primarily by enhancing arc stability, improving droplet and slag properties, achieving ultra-low spatter, reducing welding defects, and optimizing weld formation. Through complex metallurgical reactions, they form composite inclusions and solid solutions, which can purify the weld, refine the grain, and induce needle-like ferrite nucleation, thereby enhancing the strength, toughness, and corrosion resistance of the weld. Depending on the method of preparing the welding materials, the way and form in which rare earths are added significantly affect their transition rate. Compared to traditional analysis methods, inductively coupled plasma analysis technology has a more pronounced advantage in detecting the content of rare earth elements in the weld. The current understanding of the mechanisms by which rare earth elements operate in weld metal is still not entirely clear, and the methods of addition and detection also limit their further application and development in welding materials. Future efforts need to focus on researching the functioning mechanisms of rare earth elements in weld metal, optimizing the amount and methods of adding rare earth elements, and establishing comprehensive detection standards to promote the application of rare earths in low-alloy high-strength steel welding materials.关键词：high strength low alloy;welding metallurgy;microstructure property;weldability;rare earth addition;chemical testing19|4|0更新时间：2025-03-28
- 摘要：With the rapid development of the international liquefied natural gas (LNG) industry, the demand for cryogenic materials for and transportation is increasingly urgent. In order to balance the service performance and manufacturing cost of materials, high manganese steel for cryogenic temperature has attracted extensive attention. properties of high manganese steel materials for LNG storage tank, the formation mechanism of hot cracks in the welding process, the burning loss path of alloy elements, the influencing factors of the performance degradation of welded joints in the cryogenic environment were detailed discussed, and the preventive measures in the actual welding application process were proposed. the same time, the application status of common welding process methods for low temperature high manganese steel and its influence law on the performance are introduced, and the development of new welding methods in the application of low temperature high manganese steel is discussed, in order to provide a reference basis for the high-quality welding application of LNG storage tank.关键词：Liquefied natural gas (LNG) storage tank;Low temperature high manganese steel;weld33|7|0更新时间：2025-03-28
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