Tensile and fracture behavior of DZ951 Ni-base superalloy
(1.辽宁省沈阳市科学院金属研究所
2.北京市科学院研究生院
3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4.Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China)
2.北京市科学院研究生院
3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4.Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China)
Abstract: The tensile and fracture behavior of DZ951 directionally solidified Ni-base superalloy was studied in the temperature range of 20？1 100 ℃. The fracture mode was examined by scanning electron microscopy. The results show the experimental temperature has no significant effect on the tensile strengths, which are greater than 1 000 MPa from room temperature to 800 ℃. The yield strength reaches its maximum (970 MPa) at 800 ℃. When the experimental temperature is higher than 800 ℃, the tensile and yield strengths decrease evidently and the ductility increases remarkably. The fractograph of fracture surface for the tensile specimen at room temperature shows a dimple-ductile fracture mode. The fractograph from 600 to 800 ℃ shows a slide fracture mode. The fractograph from 900 to 1 100 ℃ exhibits a creep rupture mode with uneven deformation.
Key words: Ni-base superalloy; tensile strength; yield strength; fractograph