热连轧J55钢的V_（GC）参数测试

V_(GC)PARAMETER EXAMINATION ON HOT CONTINUOUS ROLLING J55 STEEL

分别用光滑和轴对称切口两种圆柱形拉伸试样对６ｍｍ厚热轧Ｊ５５钢进行了Ｖ_（ＧＣ）参数测试，结果表明：Ｖ_（ＧＣ）参数因试样取向不同而存在较大差异，但与试样形式无关。这一结果和试验材料在板面上存在各向异性是一致的，本试验为采用小试样评价材料断裂特性提供了尝试。

V(GC) parameter examinations on hot continuous rolling J55 steel with its thichness of 6mm have been carried out seperately using two kinds of cylinder tensile specimen with smoth and axial symmetry cross-section. It is show that V(GC)parameter are great different with different specimen orientation,and have nothing to do with the type of specimen,which is compatible with anisotropism existing in the surface of test materials. And the experiment provide an evidence on essessing the fracturing behavoir of small-specimen.