通过采取相应的控制措施，杜绝了硬度偏低现象的发生。
The phenomenon of the low hardness was avoided by using corresponding measures.
然而PUD存在固含量低、涂膜硬度偏低、耐水性不好等缺点，需要对其进行有效的改性。
However, PUD possess some shortcomings including low solid content, low hardness and not so good chemisty-resistance, it is necessary to modified PUD.
结果表明：该曲轴硫化物夹杂偏多、组织偏析导致曲轴强度和硬度偏低，引起曲轴疲劳断裂。
The results indicate that the low strength and hardness, resulting from the Sulfide inclusions and organizational segregation, led to the crankshaft fatigue fracture.
银合金作为导电环材料，因其硬度偏低、耐磨性差，影响使用寿命，同时，还存在价格昂贵的问题。
When silver alloy is used as conducting ring material, its service life is influenced by its slightly low hardness and bad abrasion resistance behavior, meanwhile it is prohibitive.
通过工艺试验从铸造工艺和原材料质量两方面进行原因查找，获得了现有生产条件下造成硬度偏低的原因。
Trough technological test, the reason of low hardness was checked from two aspects:the casting process and raw material, so the reason was obtained.
结果表明，冷却不足使组织中出现网状及小块状铁素体，导致硬度偏低，加之磨削加工痕迹较粗是引起前轮毂早期断裂的原因。
Results showed that ferrite net and lower hardness due to low cooling rate, coarser finish machining resulted in the fracture during earlier stage of rotary bending fatigue test.
结果表明，冷却不足使组织中出现网状及小块状铁素体，导致硬度偏低，加之磨削加工痕迹较粗是引起前轮毂早期断裂的原因。
Results showed that ferrite net and lower hardness due to low cooling rate, coarser finish machining resulted in the fracture during earlier stage of rotary bending fatigue test.
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