CYCLIC STRESS‐STRAIN, STRESS‐TEMPERATURE AND STRESS‐ELECTRICAL RESISTANCE RESPONSE OF NiCuMo ALLOYED SINTERED STEEL
CYCLIC STRESS‐STRAIN, STRESS‐TEMPERATURE AND STRESS‐ELECTRICAL RESISTANCE RESPONSE OF NiCuMo ALLOYED SINTERED STEEL
复制标题
NiCuMo合金烧结钢的循环应力-应变、应力-温度和应力-电阻响应
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
D. Eifler
中科院分区：
文献类型：
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作者：
G. Biallas;A. Piotrowski;D. Eifler
-确定了烧结温度对NiCuMo合金疲劳性能的影响。通常的做法是用塑性应变幅值来表征循环变形行为。对于烧结材料，塑性应变幅值的大小受微观组织变化以及裂纹张开和裂纹扩展效应的影响，并且不允许在这些机制之间有任何区别。为了更全面地描述烧结钢的疲劳行为，本文同时研究了循环应力-应变、循环应力-温度和循环应力-电阻测量。在循环加载过程中，温度对塑性变形的作用非常敏感。电阻响应微观结构的变化，如位错重排和空洞的形成，以及裂纹的萌生和扩展。此外，连续应力增加试验是确定循环应力-应变曲线的一种合适的短期试验方法，其结果与单步试验结果非常吻合。
—The influence of sintering temperature on the fatigue behaviour of a NiCuMo alloy was determined. It is common practice to characterize the cyclic deformation behaviour by means of plastic strain amplitudes. For sintered materials the quantity of the plastic strain amplitudes is influenced by microstructural changes as well as crack opening and crack growth effects and does not allow any distinction between these mechanisms. In the present work cyclic stress-strain, cyclic stress-temperature and cyclic stress-electrical resistance measurements were studied simultaneously to get a more comprehensive description of the fatigue behaviour of sintered steels. The temperature is essentially sensitive to the work of plastic deformation during cyclic loading. The electrical resistance responds to microstructural changes, e.g. dislocation rearrangements and void formation as well as to crack initiation and propagation. Beyond that it is shown that continuous stress-increase tests are a suitable short term testing method to determine cyclic stress-strain curves which are in a very good agreement with those from single step tests.