Microstructure development and superplasticity in Inconel*718 sheet

作者：Huang Y; Blackwell PL^*

来源：Materials Science and Technology, 2003, 19(4): 461-466.

DOI：10.1179/026708303225002000

Within the range of temperatures and strain rates investigated, mechanical testing identified the optimum forming condition for Inconel 718 sheet as being 965degreesC with a strain rate of 10(-4) s(-1). A detailed investigation of the microstructural behaviour under these deformation conditions was carried out and is reported here. Typically superplastic deformation would generate an enhanced rate of grain growth. This was not the case with the present material; instead it was found that a slight apparent grain size reduction occurred and there was evidence of substantial dislocation activity. It was concluded that the material was deforming on the borderline between 'true' superplasticity and normal slip based deformation.

• 出版日期2003-4