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  • Emerald  (3)
  • 2020-2024  (3)
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  • Emerald  (3)
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  • 2020-2024  (3)
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  • 1
    In: Rapid Prototyping Journal, Emerald, Vol. 28, No. 9 ( 2022-10-14), p. 1706-1716
    Abstract: This study aims to investigate the influence of the gas-flow field distribution and design on the parts quality of 316L stainless steel and the vapor–spatter behavior. Design/methodology/approach Based on the hot-wire wind speed test method, the exact value of the gas velocity at different locations was accurately measured to establish the effect on the porosity and the mechanical properties of the parts. The influence of the placement of single or dual blow screens on the performance of the parts quality was also studied. Through scanning electron microscope and energy dispersive spectrometer, high-speed photography and other methods, the influence mechanism was explained. Findings It was found that too high or too low gas velocity both play a negative role, for 316L stainless steel, the range of 1.3–2.0 m/s is a suitable gas field velocity during the multilaser powder bed fusion process. And printing quality using dual blow screens is better than single. Practical implications The optimization of gas field design and optimal gas velocity (1.3–2.0 m/s) applied during laser melting can improve the quality of ML-PBF of 316L stainless steel. Originality/value This study showed the influence of the gas field on the spatter–vapor in the process during ML-PBF, and the unfavorable gas field led to the formation of pores and unmelted powders.
    Type of Medium: Online Resource
    ISSN: 1355-2546 , 1355-2546
    Language: English
    Publisher: Emerald
    Publication Date: 2022
    detail.hit.zdb_id: 2002657-2
    SSG: 11
    Location Call Number Limitation Availability
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  • 2
    In: Rapid Prototyping Journal, Emerald, Vol. 29, No. 4 ( 2023-04-04), p. 731-740
    Abstract: This paper aims to better control the mechanical properties and functional properties of NiTi alloy. Design/methodology/approach NiTi alloy samples with equal atomic ratio were formed by selective laser melting (SLM). X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy and tensile testing methods were used to study the effects of different laser power and scanning speed on the densification behavior, phase transformation characteristics and mechanical properties of NiTi alloy. Findings Compared with the laser power, the variation of the keyhole effect caused by the change of scanning speed is more intense, which has a greater effect on the densification behavior of SLM NiTi alloy. The effect of the laser power on the phase transition temperature is small. The increase of scanning speed weakens the burning degree of Ni element, so phase transition temperature decreases. The results of DSC test and tensile test show that the scanning velocity can significantly change the phase transition temperature, martensite twins reorientation and stress–strain behavior of SLM NiTi alloy. Originality/value This study provides a potential method to regulate the mechanical properties and functional properties of NiTi shape memory alloy in the future and NiTi alloys formed by SLM with good elongation were obtained because the Supercellular crystal structure formed during the nonequilibrium solidification of SLM and the superfine precipitates dispersed in the alloy prevented the dislocation formation.
    Type of Medium: Online Resource
    ISSN: 1355-2546 , 1355-2546
    Language: English
    Publisher: Emerald
    Publication Date: 2023
    detail.hit.zdb_id: 2002657-2
    SSG: 11
    Location Call Number Limitation Availability
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  • 3
    In: Kybernetes, Emerald, ( 2023-01-30)
    Abstract: To examine how shareholding affects optimal profits, R & D innovation, NEV market scale and social welfare in two supply chain models with partial and cross ownership patterns. Design/methodology/approach The gradual retreat of government subsidies has directly weakened the financial support available to the stakeholders of new energy vehicles (NEVs). In this context, upstream and downstream enterprises of NEV are constantly seeking new business models of cooperation to achieve possible win-wins. NEV supply chain shareholding is an emerging new practice for such explorations. However, its performance in the NEV supply chain is seldom investigated. In this paper, we employ a Stackelberg game model to investigate how partial and cross-ownership affect the optimal decisions in a NEV supply chain. Findings Results showed that: (1) Compared with the unilateral shareholding model, the battery supplier will benefit from cross-ownership in the supply chain, while the NEV manufacturer will not necessarily benefit from it. At the same time, cross-ownership will bring the greatest incentive for battery R & D (2) Supply chain downstream competition will not necessarily lead to the improvement of the total consumption of NEVs or the level of battery design. Pareto improvement can be brought only when one of the manufacturers holds less than a certain equity threshold. In addition, downstream competition will also not necessarily bring more benefits to the battery supplier. Originality/value At present, NEV supply chain management has attracted widespread attention from scholars from all walks of life. Previous studies have been carried out that covers topics such as pricing strategies and optimal profits and the role of NEV in the sustainable development of the automotive industry supply chain, or disparate impacts of government subsidies and carbon emission regulation on supply chain members. However, as far as the authors know, compared with the new emerging NEV corporate practice, the shareholding phenomenon between upstream and downstream in the supply chain of NEV has not been studied in the existing studies.
    Type of Medium: Online Resource
    ISSN: 0368-492X
    Language: English
    Publisher: Emerald
    Publication Date: 2023
    detail.hit.zdb_id: 1479781-1
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