稀土变质处理可降低铸态韧性，增加硬度，同时提高热处理后的韧性及硬度。

RE modification treatment decreased as-cast impact toughness and increased hardness, at the some time, improved both the impact toughness and hardness in heat-treatment state.

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采用中频熔炼、离心雾化凝固冷却得到铸态低碳铸钢丸，并对此进行相应回火处理得到不同硬度及寿命的低碳铸钢丸。

In this thesis, series of low carbon cast steel shot were successfully obtained by medium-frequency melting and centrifugal atomization technologies and temper were performed.

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搅拌区细晶组织的显微硬度及抗拉强度相比于铸态母材有所提高，而伸长率显著提高。

The microhardness and tensile strength of stir zone increase compared with the base material, and the elongation increases significantly due to its fine and uniform microstructure of the specimen.

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