细晶区组织以马氏体为主，组织细小均匀。
Microstructure in fine grain zone was mainly composed of martensite, and its grain size was very small and uniform.
在试验的焊接条件下，WCX355超细晶钢在热影响粗晶区未有明显脆化，在回火区也未发生软化现象。
Under the experiment's welding condition, WCX355 ultrafine grained steels didn't distinctly embrittle in CGHAZ and didn't soften in tempering zone either.
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.
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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