镍基单晶高温合金的维氏硬度检测

Vickers hardness test of nickel-based single crystal superalloy

研究了检测镍基单晶高温合金维氏硬度时,不同维氏硬度试验力、压痕对角线方向、压痕位置对于测量结果的影响。结果表明,试验力大小及测量位置在枝晶干或枝晶间对于维氏硬度测量结果影响不大,而压痕对角线方向对维氏硬度测量结果有一定影响。在{100}剖面上,压痕对角线方向沿<001>晶向时硬度值最大、沿<011>晶向时硬度值最小,相差约35HV。在{111}剖面上,硬度值介于上述两者之间。镍基单晶高温合金存在各向异性,不同晶向弹性模量等存在明显差异影响了维氏硬度测量结果。

The effects of testing forces,indentation diagonal direction,and indentation location on the measurement results of Vickers hardness for nickel-based single crystal superalloy were investigated.The results indicated that the testing force and the indentation location(either at dendrite arm or in interdendritic region)had little influence on the Vickers hardness measurement results,while the indentation diagonal direction had a certain impact.On the{100}crystal plane,the hardness value was the highest when the indentation diagonal direction lied along the<001>crystal orientation,and the lowest along the<011>crystal orientation.The difference was about 35HV.On the{111}crystal plane,the hardness value was between the above maximum and minimum values.The nickel-based single crystal superalloy exhibited anisotropy so that there were significant differences in the elastic modulus and other factors on different crystal orientations,which affected the measurement results of Vickers hardness.