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Microstructure and porosity formation of spray-formed GCr15 steel billets

机译：喷射成形GCr15钢坯的组织和孔隙形成

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摘要

Dense billets of GCr15 bearing steel were successfully fabricated by spray forming. Microstructure and porosity of spray-formed GCr15 steel under different spray conditions were analyzed. The results show that the microstructure of as-sprayed GCr15 steel is composed of refining pearlite, and different spraying conditions caused a different size of pearlite colonies. Besides, the chemical composition remains high homogeneity in the spray-formed billet. The morphologies and distribution of porosity are mainly determined by the thermal condition of spray forming. The increase of the GMR (gas to metal mass ratio) leads to the porosity evolution from interstitial pore to gas pore.
机译：通过喷涂成功地制造了GCr15轴承钢的致密坯。分析了喷射条件下喷射成形的GCr15钢的组织和孔隙率。结果表明，喷镀后的GCr15钢的显微组织是由精炼的珠光体组成的，不同的喷涂条件导致珠光体菌落的大小不同。此外，在喷雾成形的坯料中化学成分保持高均质性。孔隙的形态和分布主要取决于喷射成形的热条件。 GMR（气体与金属的质量比）的增加导致孔隙度从间隙孔隙演变为气体孔隙。

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