It is resulted Widmanstatten structure, inclusion and banded structure are mainly reasons causing impact property lowness.
结果表明，钢中魏氏体组织、非金属夹杂物及带状组织是导致冲击性能偏低的主要原因。
The specimens with Widmanstatten structure have higher impact strength and lower ductile-brittle transition temperature than those with equiaxial granular ferrite structure.
有魏氏组织的试样较呈等轴铁素体的试样有更高的冲击韧性和更低的韧脆转变温度。
The results show that the cracking of the tap valve is brittle crack, which is due to overheat to cause the formation of defects, such as coarse grains, Widmanstatten structure and porosity.
结果表明，水龙头阀体开裂是由于存在过热造成的晶粒粗大、魏氏组织、铸造疏松等缺陷引起的脆性开裂。
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