共查询到19条相似文献,搜索用时 15 毫秒
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对20CrMnMo钢制动密封轴渗碳后开裂原因进行了失效分析,指出了造成开裂的原因,并提出了防止开裂的办法。 相似文献
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分析了消失模铸造铸铁件金属渗透缺陷的形成机理,指出涂层开裂是造成金属渗透的主要原因。建立模型分析了涂层开裂的原因,运用材料力学理论建立了涂层开裂的判据,并在生产现场进行经验。 相似文献
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对DIN-100MnCrW4模具钢开裂原因进行了分析。结果表明,模具钢 属淬火开裂,主要原因是材料内部组织不均匀所致。 相似文献
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通过对冷拔钢管在生产过程中产生的附加应力分析,借助于金相显微镜,带能谱仪(EDX)的扫描电子显微镜(SEM),对冷拔开裂的OCr18Ni9不锈钢管的开裂原因进行了分析,发现开裂是由尺寸较大的夹杂物诱发引起的,而沿晶析出的σ相是使钢变脆的原因。 相似文献
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杭州钢铁集团公司生产的ML35(B)冷镦钢盘条,在镦制内六角螺栓时发生了开裂现象。对导致开裂的各种原因进行了试验分析,最终确认导致ML35(B)盘条镦制内六角螺栓开裂的原因在于盘条内部的偏析线,而产生偏析线的原因在于连铸坯的角部裂纹。在采取提高连铸坯质量的措施后,此类缺陷可以有效消除。 相似文献
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分析了多面壳体胀形开裂的原因,认为内侧焊趾处的塑性应变集中和热影响区塑性降低是引起开裂的主要原因,在此基础上,提出了防止胀形开裂的工艺方法,即由转移焊道和回火焊道组成的补偿焊法,通过实验研究说明,补偿焊法提高球壳体焊接接头工艺塑性和防止胀形开裂的原因在于转移焊道改变了内侧熔合线方向和改善焊趾形状;回火焊道改善了热影响区的组织,降低了热影响硬度,提高热影响区的塑性。 相似文献
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采用化学分析、金相检验及力学性能测定等方法,对锅炉水冷壁管开裂的原因进行了分析。结果表明,水冷壁管存在的组织缺陷、弯曲处管壁较薄及蒸汽量不足是造成其开裂的主要原因,并提出了相应的预防措施。 相似文献
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采用化学分析、金相检验及力学性能测定等方法,对锅炉对流管爆裂原因进行了分析。结果表明,长期超温运行而引起的蠕变是导致爆裂的主要原因。 相似文献
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对高风压潜孔钻头使用时钻头体崩块、掉齿等早期失效情况进行分析,找到其失效原因。通过改进热处理工艺.采用低浓度渗碳等,取得了较好的效果。 相似文献
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通过对螺旋缝焊管进行静水压爆破试验,得出钢管的屈服压力、最大压力值和爆破压力值,验证钢管成型和焊接工艺的合理性,为管线的设计单位和用户提供参考依据.介绍了螺旋缝焊管静水压爆破试验所用的装置;分析了爆破试验管的管内承压状况、爆破试验过程以及不同起爆点的由来,并以X65钢级Φ813 mm×9.5mm螺旋缝焊管的爆破试验进行... 相似文献
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Grinding tools like one side recessed grinding wheels are used in many machining applications and must provide a high reliability
against fracture concerning safety-relevant and economic aspects. The calculation of the bursting speed on the basis of the
mechanical properties is an important tool for the design of grinding wheels. However, no equation is available to estimate
the bursting speed of these types of grinding tools so far. For the calculation of the bursting speed of one side recessed
grinding wheels a parametric study using FEA was carried out. The results of these investigations provide the basis for a
geometric function, which allows in association with a newly-developed fracture criteria to calculate the bursting speed of
one side recessed grinding wheels. For the validation of the developed concept spin burst tests with grinding wheels of eight
different geometries and two granulations were carried out. The results of these investigations show a very good correlation
of the calculated and measured bursting speeds for all tested types of grinding wheels. 相似文献
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《中国有色金属学会会刊》2016,26(11):2892-2899
The prediction of central bursting defects in the rod extrusion process through conical dies using the upper bound analysis is investigated. A kinematically admissible velocity field, including the radial and angular velocity components, is proposed. A new criterion is presented to predict the occurrence of the central bursting defects. Parameter bobt, which represents the risk probability of cracking, is proposed. It is calculated using the shape of the boundary at the entrance by minimizing the total power dissipation during the extrusion process. When bobt is equal to or greater than bcr, central bursting occurs. Furthermore, the quantitative relationships between central bursting defects and process parameters (semi die angle, reduction in area and frictional factor) are studied. The results show that the central bursting defects are affected primarily by the reduction in area and the friction factor. The presented criterion is verified by comparing with the FEM simulation data and the results of the published paper. 相似文献
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00Cr17Ni14Mo2钢锻裂分析 总被引:1,自引:0,他引:1
本文对00Cr17Ni14Mo2铝锭不锈钢锻造开裂问题进行了试验和验证,结果表明,锻裂主要是由于加热不当和采用传锭坯所致。并提出了改进措施。 相似文献