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小冲杆试验技术可以利用小体积材料获取宏观材料的力学性能。提出基于Beremin模型估算铁素体钢在韧脆转变区的Weibull参数(m,σu)的方法。为了研究选取此方法的试样类型,在韧脆转变区对4种不同试样类型进行试验。根据试验曲线对比、SEM(扫描电镜)分析和拟合曲线结果,得出0.5mm厚的CHSP试样(直线缺口小冲杆试样)是4种试样类型中最适合用于此方法的试样类型。同时证明了用基于Beremin模型的小冲杆试验技术估算材料的Weibull参数的方法是可行的,并通过该方法实现了用小试样获取材料在韧脆转变区的累积失效概率。
Small punch test technology can use a small volume of material to obtain the mechanical properties of macroscopic materials. A method of estimating Weibull parameters (m, σu) of ferrite steel in ductile-brittle transition zone based on Beremin model was proposed. In order to study the type of specimens selected for this method, four different specimen types were tested in the ductile-brittle transition zone. According to the test curve comparison, SEM (scanning electron microscopy) analysis and fitting curve results, it is concluded that a 0.5 mm thick CHSP sample (straight notched small punch sample) is the most suitable one for the four sample types Kind of type At the same time, it is proved that it is feasible to estimate the Weibull parameter of the material by using the small punch test technology based on Beremin model. By this method, the probability of cumulative failure of the material in the ductile-brittle transition zone can be obtained by the method.