Abstract
Miniature and standard specimens, were cut from the anisotropy materials with axial, central and radial directions to study the mechanical property. In the paper, main research focused on the small punch test (SPT) with un-notched and U-shaped notched specimen in low temperature. Through the small punch energy variation with temperature, the ductile-brittle transition temperature by the small punch test (T SP ) can be determined. The results indicated that there was no obvious difference among three different directions in transformation temperature of SPT with un-notch specimens, and it cannot represent upper plateau impact energy of three different directions. And the SPT with U-shaped notched specimens can determine the differences of upper plateau fracture energy of three different directions. Therefore, SPT with U-shaped notch specimens was more useful to evaluate the material anisotropy.
Highlights
The small punch test (SPT) originated in the 1980s and was proposed by Baik [1] et al, by which various material properties could be obtained from a fairly small disk specimen with an almost nondestructive
In order to investigate the anisotropy of the impact toughness of A350 flanged forging, the flange should be sampled according to the fracture surface with different notch direction
The results of conventional tensile test in three different directions of the A350 showed that the A350 has obvious anisotropy and the axial tensile properties is the worst, but the results of Charpy impact test showed that the difference in ductile-brittle transition temperature is a little among three different directions, while the upper shelf impact energy have obvious differences, which is the lowest in axial direction, and is consistent with the tensile properties
Summary
The small punch test (SPT) originated in the 1980s and was proposed by Baik [1] et al, by which various material properties could be obtained from a fairly small disk specimen with an almost nondestructive. The smallpunch testing method has been applied successfully to evaluate a variety of material mechanical properties, such as yield strength, rupture strength, ductile-brittle transition temperature, fracture toughness [2] and creep performance [3]. The mechanical properties of each anisotropic material cannot be obtained in different directions by SPT. This paper study the A350 flanged forging by changing the conventional pattern specimens of SPT, in order to effectively characterizing the anisotropic materials, which has certain guiding significance for evaluating the toughening brittle characteristics of anisotropic materials and has a certain help for the improvement of the technology of small punch test in the future research
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