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Spray forming

About: Spray forming is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 12869 citations. The topic is also known as: spray casting & spray deposition.


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Journal ArticleDOI
TL;DR: In this paper, the temperature change process of a single sprayed composite powder during the self-reactive spray forming process for preparing the Ti (C,N)-TiB2 ceramic preforms was numerically simulated by means of finite element analysis.
Abstract: The temperature change process of the single sprayed composite powder during the self-reactive spray forming process for preparing the Ti (C,N)-TiB2 ceramic preforms was numerically simulated by means of finite element analysis. The results show that after the sprayed composite powder with grain size of 50μm has entered the flame field for 0.35ms, the surface temperature of it will reach the igniting temperature and the self-propagating high-temperature synthesis (abbr. SHS) reaction will take place. The heating rate of the particle in this period is about 2.82×106°C/s. After the SHS reaction has taken place, the heating rate becomes quicker because of the double function of the flame and the reactive heat release. When the temperature of the sprayed particle is higher than that of the flame, the heat exchange process will turn into heat absorption from heat release, which leads to the great drop of the heating rate (about 1.20×106°C/s). The composite powder completes the reaction in 0.88ms and reaches the highest temperature of 2920°C, which makes it become a ceramic droplet. After the reaction has finished, the droplet cools down quickly from exterior to interior, and the surface temperature of it descends to the theoretic eutectic melting point of the composite ceramics (2620°C) after 0.34ms. Then the droplet begins to solidify at some degree of supercooling and becomes ceramic particle. The numerically simulated results before, during and after the reaction match the water-quenching experiments of the sprayed particle with particle size of 50μm during the corresponding period. It indicates the heat process of the sprayed composite powder on the whole, which is composed of being heated, heat releasing, cooling and solidifying.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructures and hardness of spray-formed and aged H13 steel were investigated by OM, SEM, XRD and hardness tester, and the results showed that the micro-structures of the spray-form steel are characterized by lower bainite, martensite and much more retained austenite, inducing lower hardness than the as-cast H13.
Abstract: The microstructures and hardness of spray-formed and aged H13 steel were investigated by OM, SEM, XRD and hardness tester. Compared to the as-cast H13 steel, the microstructures of the spray-formed H13 steel is characterized by lower bainite, martensite and much more retained austenite, inducing lower hardness than the as-cast H13. The peak aging temperature for the spray-formed H13 steel is 50°C higher than the commercial H13 steel (500°C) for their different microstructures. After aged at 550°C for 50h, a much higher hardness (about 53 HRC) can be retained in the spray-formed H13 steel, showing an excellent thermal stability at 550°C.

1 citations

Book ChapterDOI
05 Jan 2006

1 citations

Journal ArticleDOI
TL;DR: In this paper, various properties of plasma sprayed coatings of a titanium alloy were assessed for obtaining optimum spray forming conditions of the alloy, and the results indicated that a low-pressure plasma spraying is a potential method for forming plasma sprayed parts of the titanium alloy.
Abstract: Various properties of plasma sprayed coatings of a titanium alloy are assessed for obtaining optimum spray forming conditions of the alloy. The results obtained indicate that a low-pressure plasma spraying is a potential method for forming plasma sprayed parts of the titanium alloy.

1 citations

01 Jan 2000
TL;DR: In this paper, the production process and studies for the workability of the flat products are presented, as well as a detailed discussion of the potentials of the spray forming process for other products, e.g. in sheet metals.
Abstract: The production of flat products by spray forming, offers the possibility of the manufacturing of thin semi-finished material with optimized material properties. With the production of such thin slabs or sheet metals the small initial thickness reduces the range of following transforming handling steps. The occurring process-determined porosity, which appears negligible with large volume deposits, as well as problems with the production of a geometry suitable for the subsequent treatment, however obstruct the commercial use of the potentials of the spray forming process for other products, e. g. in sheet metals. The production process and studies for the workability of the flat products are the subject of this paper.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202216
202117
202037
201933
201826