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Influence of mechanical reduction amount on internal quality of continuous casting billets by thermal and numerical simulation
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作者 Dan-qing Jiang shu-jian sun +5 位作者 Han Wu Yang-jian Xu Fu-hai Zhu Zhen-qiang Zhang Jiang Wang Zhong-ming Ren 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第6期1234-1243,共10页
With establishment of thermal and numerical simulation models,the influence of reduction amount on solidification structure,segregation and shrinkage porosity of continuous casting(CC)billets was investigated.The ther... With establishment of thermal and numerical simulation models,the influence of reduction amount on solidification structure,segregation and shrinkage porosity of continuous casting(CC)billets was investigated.The thermal–mechanical coupled simulation results indicated that with an increase in reduction amount,the temperature in the central area decreases,and the reduction efficiency firstly increases and then decreases,reaching the maximum value at reduction amount of 6 mm.Metallographic analysis showed that increasing the reduction amount is beneficial for the refinement of central solidification structure.Moreover,the internal cracks are more likely to appear at higher reduction efficiency.The X-ray computerized tomography results revealed that a higher reduction amount can significantly reduce the volume fraction and equivalent diameter of the central shrinkage porosities of CC billets and increase the sphericity of them.Simultaneously,the macrosegregation of carbon along the central line is improved as the reduction amount increases;while the reduction amount exceeds 8 mm,the segregation degree will not change any more. 展开更多
关键词 Mechanical reduction Solidification structure POROSITY Thermal simulation Continuous casting billet
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Design, development, and performance of an ammonia self-managed vaporization propulsion system for micro-nano satellites 被引量:3
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作者 shu-jian sun Tao MENG Zhong-he JIN 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2019年第11期1516-1529,共14页
An ammonia self-managed vaporization propulsion (ASVP) system for micro-nano satellites is presented. Compared with a normal cold gas or liquefied gas propulsion system, a multiplex parallel sieve type vaporizer and r... An ammonia self-managed vaporization propulsion (ASVP) system for micro-nano satellites is presented. Compared with a normal cold gas or liquefied gas propulsion system, a multiplex parallel sieve type vaporizer and related vaporization control methods are put forward to achieve self-managed vaporization of liquefied propellant. The problems of high vaporization latent heat and incomplete vaporization of liquefied ammonia are solved, so that the ASVP system takes great advantage of high theoretical specific impulse and high propellant storage density. Furthermore, the ASVP operation procedure and its physical chemistry theories and mathematical models are thoroughly analyzed. An optimal strategy of thrust control is proposed with consideration of thrust performance and energy efficiency. The ground tests indicate that the ASVP system weighs 1.8 kg (with 0.34-kg liquefied ammonia propellant) and reaches a specific impulse of more than 100 s, while the power consumption is less than 10 W. The ASVP system meets multiple requirements including high specific impulse, low power consumption, easy fabrication, and uniform adjustable thrust output, and thus is suitable for micro-nano satellites. 展开更多
关键词 Self-managed vaporization Liquefied ammonia Milli-Newton level propulsion MICRO-THRUST High-precision orbital control Micro-nano satellite
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