Cyclic Hardness Test PHYBALCHT: A New Short-Time Procedure to Estimate Fatigue Properties of Metallic Materials
Cyclic Hardness Test PHYBALCHT: A New Short-Time Procedure to Estimate Fatigue Properties of Metallic Materials
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循环硬度测试 PHYBALCHT：一种估算金属材料疲劳性能的新短时程序
DOI：
10.1007/978-3-319-48191-3_6
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发表时间：
2015
影响因子：
6
通讯作者：
D. Eifler
中科院分区：
文献类型：
--
作者：
H. Kramer;M. Klein;D. Eifler
表征金属材料疲劳行为的传统方法非常耗时且成本高昂。这就是凯泽斯劳滕大学材料科学与工程研究所开发新的短时程序 PHYBALCHT 的原因。这种创新方法仅需要平坦的材料表面即可执行循环力控制硬度压痕测试。为了表征测试材料的循环弹塑性行为，绘制了力-压痕-深度-滞后的变化与压痕循环次数的关系。根据塑性应变振幅，在半最小力下测量磁滞回线的压痕深度宽度，称为塑性压痕深度振幅。其随压痕周期数变化的变化可以用幂律来描述。这些幂律之一包含硬化指数 CHTeII，它与传统恒幅疲劳测试中的循环硬化量密切相关。为了确定热处理参数和具有高硬化率的 SAE 52100 TRIP 合金及其损伤容限，使用了 PHYBALCHT 和 PHYBALLIT 方法。对一种改进的 SAE 52100 TRIP 合金进行了详细研究。研究了所选 SAE 52100 TRIP 合金的疲劳行为和循环硬化，并与传统的 SAE 52100 进行比较。传统的应力控制疲劳测试在伺服液压测试系统上进行，频率为 5 Hz，负载比为 R= -1。确定了不同的循环硬化率。导致裂纹萌生的非金属夹杂物的尺寸和失效的循环次数被用来评估损伤容限能力的差异。
Conventional methods to characterize the fatigue behavior of metallic materials are very time and cost consuming. That is why the new short-time procedure PHYBALCHTwas developed at the Institute of Materials Science and Engineering at the University of Kaiserslautern. This innovative method requires only a planar material surface to perform cyclic force-controlled hardness indentation tests. To characterize the cyclic elastic-plastic behavior of the test material the change of the force-indentation-depth-hysteresis is plotted versus the number of indentation cycles. In accordance to the plastic strain amplitude the indentation-depth width of the hysteresis loop is measured at half minimum force and is called plastic indentation-depth amplitude. Its change as a function of the number of cycles of indentation can be described by power-laws. One of these power-laws contains the hardening-exponentCHTeII, which correlates very well with the amount of cyclic hardening in conventional constant amplitude fatigue tests.To identify heat-treatment-parameters and SAE 52100 TRIP-alloys with high hardening rates as well as their damage tolerance the PHYBALCHT- and PHYBALLIT-method were used. One modified SAE 52100 TRIP-alloy was investigated in detail. The fatigue behavior and the cyclic hardening of the selected SAE 52100 TRIP-alloy was investigated and compared with conventional SAE 52100. Conventional stress-controlled fatigue tests were performed on a servo-hydraulic test system with a frequency of 5 Hz and a load ratio ofR= −1. Different rates of cyclic hardening were identified. The size of the nonmetallic inclusions leading to crack initiation and the number of cycles to failure were used to evaluate differences in the damage tolerance capability.
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