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Effect of specimen size on small punch creep behavior of high nitrogen ferritic heat-resistant steels

机译：试样尺寸对高氮铁素体耐热钢小冲头蠕变行为的影响

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摘要

The small punch (SP) creep tests were carried out on different high nitrogen ferritic heat-resistant steels in the temperature range of 650–800 °C, in the load range of 55–400 N, using disc-type specimens measuring ∅8 × 0.5 mm (∅8 mm) and ∅3 × 0.25 mm (∅3 mm). The influence of specimen size on SP creep behavior and on the conversion of SP creep rupture results to conventional uniaxial creep rupture results were investigated. The creep deflection and rupture life of ∅3 mm specimens were much smaller/shorter than those of the ∅8 mm specimens. The experimentally determined SP load-uniaxial stress conversion coefficients to correlate SP and uniaxial creep rupture life were different for the two specimens; 2.05 and 0.49 for ∅8 mm and ∅3 mm specimens, respectively. These observed effects were considered as virtual specimen size effects as these could occur not only due to specimen size but also due to geometrical parameters of the test rig. The conversion coefficients were found to be independent of the type of steels investigated. The conversion coefficients determined from finite element analysis, 2.03 and 0.47 for ∅8 mm and ∅3 mm specimens, respectively, were in close agreement with those obtained from experimental results. Based on the close agreement between the experimental creep rupture life and that predicted using finite element analysis results, it was found that there was no significant actual specimen size effect on the creep rupture life.
机译：小冲头（SP）蠕变测试是在650–800°C的温度范围内，在55–400 N的载荷范围内使用尺寸为8×的圆盘型试样对不同的高氮铁素体耐热钢进行的0.5 mm（∅8mm）和∅3×0.25 mm（∅3.mm）。研究了试样尺寸对SP蠕变行为以及SP蠕变断裂结果转换为常规单轴蠕变断裂结果的影响。 ∅3mm试样的蠕变挠度和断裂寿命比/ 8 mm试样小/短。通过实验确定的将SP与单轴蠕变断裂寿命相关联的SP载荷-单轴应力转换系数对于两个样本而言是不同的。 ∅8mm和∅3mm的样品分别为2.05和0.49。这些观察到的影响被认为是虚拟的样本尺寸效应，因为这些效应不仅可能由于样本尺寸，而且由于试验台的几何参数而发生。发现转换系数与所研究的钢的类型无关。由有限元分析确定的conversion 8，mm和∅3mm样品的转换系数分别为2.03和0.47，与实验结果非常接近。根据实验蠕变断裂寿命与使用有限元分析结果预测的紧密一致，发现对蠕变断裂寿命没有明显的实际试样尺寸影响。

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