Crack in neck of hollow shaft is a very serious malfunction, main cause of the crack include: foundry defect, centralized stress, quality problems of welding and heat treatment.
中空轴轴颈裂纹是水泥磨的严重故障。中空轴轴颈裂纹产生的原因主要有：铸造缺陷，应力集中，焊接和热处理质量问题等。
By experiment and production practice, it was pointed out that such crack could be prevented by control of pick forming, heat treatment and grinding process.
试验与生产结果表明，提高粗加工挑扣成形质量、改善热处理组织、控制磨削工艺可以有效地防止磨削裂纹的产生。
After the heat treatment process was improved on, factors inducing part to crack were decreased, the quenching of part became easy to operate and the heat treatment quality of part was ensured.
对热处理工艺改进后，减少了诱发零件开裂的因素，降低了淬火操作的难度，保证了该零件的热处理质量。
Suitable heat treatment will increase the crack extension energy, and improve the plasticity of the composite.
适当的热处理可提高裂纹扩展所需塑性功，从而在一定范围内改善复合材料塑性。
A crack is found after SR heat treatment in the vertical welding fusion line for water distribution ring pipe of a electric machinery.
某设备制造厂电机配水环管立缝在消除应力热处理后，熔合线附近出现裂纹。
The effect of re modification and heat treatment on formation of thermal fatigue crack in low chromium wear-resistant cast iron was investigated.
研究了稀土变质及热处理对低铬耐磨铸铁热疲劳裂纹形成的影响。
After using the heat treatment process that is improved the crack rate of high speed steel rolls drops by more than 90%, which obviously improves the percent pass of product.
应用改进后的工艺热处理高速钢轧辊，轧辊裂纹率减少90%以上，明显提高了轧辊生产合格率。
The results showed that the reasons of crack was of grain growth caused by improper heat treatment.
结果表明：裂纹是热处理不当造成晶粒长大所致。
It's a feasible practice to quench in air for castings made of steels with higher hardenability to reduce or avoid its deformation and crack during heat treatment process.
采用高淬透性钢进行空冷淬火是一种减少铸件热处理变形和开裂的有效措施。
The results show that the axle has defects in heat treatment, which leads to micro crack in early stage of service life and the extended crack finally causes fatigue fracture.
结果表明，该轴热处理上存在的不合理之处，导致轴在服役早期出现微裂纹，部分微裂纹在工作应力的作用下疲劳扩展，最终产生疲劳断裂。
Several factors leading to quenching crack of dovetail cutters were analyzed. The heat treatment process was designed to prevent dovetail cutters from cracking.
分析了导致鸽尾铣刀产生淬火裂纹的因素，设计了能有效预防鸽尾铣刀淬裂的热处理工艺。
Heat treatment process has no effect on the propagation mode of thermal fatigue crack and the shape of crack at the sample notch.
热处理工艺对裂纹在试样缺口处的形态及裂纹的传播方式无影响。
The results reveal that the crack failure of the mould is mainly attributed to the electrical discharge machining, the improper heat treatment process and the impact of liquid metal.
结果表明，压铸模具的失效原因主要是：电加工导致的缺陷，材料热处理工艺不当，以及金属液的冲击等。
The results show that the screw breakage is due to quenching crack from improper heat treatment. The effective improvement measures to solve the problem of screw breakage are provided.
结果表明：螺钉发生断裂是由于热处理不当引起的淬火裂纹扩展所致，并提供有效的改进措施，解决了螺钉断裂问题。
This paper discussers, using phase, hardness and chemical examination handle the netting crack on the surface of the textile machinery spare parts which have undergone heat treatment and grinding.
利用金相、硬度、化学分析等检测手段，对纺织机械零件在热处理和磨削加工后表面出现龟裂特征进行金相分析。
This paper discussers, using phase, hardness and chemical examination handle the netting crack on the surface of the textile machinery spare parts which have undergone heat treatment and grinding.
利用金相、硬度、化学分析等检测手段，对纺织机械零件在热处理和磨削加工后表面出现龟裂特征进行金相分析。
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