“…Previous studies have reported that additions of Si influence the properties of Ni-based superalloys; see for example [19][20][21]. It has been shown that Si may segregate into interdendritic regions during solidification of a directionally solidified superalloy [22].…”
“…Previous studies have reported that additions of Si influence the properties of Ni-based superalloys; see for example [19][20][21]. It has been shown that Si may segregate into interdendritic regions during solidification of a directionally solidified superalloy [22].…”
“…Extensive growth of Delta phase colonies [ 1, 2, 41, relatively higher carbon (O.O37wt% as compared to O.O21wt% in alloy 706, Table II), and formation of a-Cr [ 151 may have been responsible for lower impact strength of exposed alloy 7 18. Low impact strength of as produced and exposed alloy 909 is due to the presence of globular Laves phase and acicular Epsilon phase [14], Figure 5i and 5j. and 706-3 (3-step aged) was essentially unaffected upon 704°C/5,000h exposure.…”
This paper presents a study of the isothermal stability of INCONEL" alloys 718, 706, 909, and WASPALOY**. Standard annealed and aged materials were exposed at 593'C up to 10,OOOh and at 704'C up to 5,000h. The exposed materials were tested for room temperature tensile, room temperature impact, and high temperature tensile. The strength of alloy 909 degraded on 593°C exposure but 706 and 718 retained their strength. At 704°C exposure, WASPALOY had the best stability in terms of high temperature strength whilst 909 was the poorest and retained only 50% of its strength. On 704°C exposure, alloy 706 and WASPALOY retained their room temperature impact strength better than ahoy 718. The tested materials were subjected to optical microscopy to develop an understanding of the reasons for the above results.
“…As can be seen, the main peaks of the laves phase and the matrix are overlapping ( Figure 3 , dark arrow). This overlap, together with the difficulty of detecting oxide phase peaks in superalloys and their dramatic effect on mechanical properties [ 2 , 16 , 17 ], makes the XRD test unsuitable for analyzing this alloy. Figure 3 XRD analysis of the as-received hot-rolled sheet of IN907 alloy.…”
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