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Hf and Zr can promote the formation of eutectic (Y+Y'), MC2, and Ni5M phases. In the alloy with equal atomic percent Zr and Hf, the solubility of Zr in eutectic 7 is lower than that of Hf, and Zr content in Ni5M is much higher than Hf. This distribution of Zr is beneficial to the formation of Ni5M and lowers the strengthening efficiency of Zr. A pretreatment of 1130"C/3hr efficiently eliminates Ni5M and, as a consequence, increases the incipient melting temperature of the alloy. The precipitation treatment of llOO"C/4hr leads to cuboidal Y' precipitation of about 0.5 pm size and causes the Hf-containing alloy to have a much higher creep strength than the Hf-free alloy in the temperature range of 760 to 105O'C. The Hf-containing alloy showed greater LCF (low cycle fatigue) life in comparison to the Hf-free alloy. A similar tendency was found when Zr was either partially or totally substituted for Hf. A higher rate of solidification facilitates enhanced LCF life due to a finer structure and more perfect orientation. Surface slip analysis showed that intersection of two sets of slip in adjacent grains occurred in the Hf-free and Hf-containing alloys, but cracking at the columnar grain boundary easily took place in the Hf-free alloy. The number of surface cracks of LCF specimens and their length per unit area are much higher in the Mar-M200 alloy. MC cracking preferentially occurs at long rod-shaped carbides perpendicular to the stress axis, and then propagates through the interdendritic region. The Hf-containing alloy cracks along the crystallographic planes by separation of slip bands.

Effect of Chemistry Modifications and Heat Treatments on the Mechanical Properties of DS MAR-M200 Superalloy