As shown in the preceding chapter, simple binary eutectic Ni-Hf and Ni-Zr braze alloys can be used to successfully join In738 Ni-base superalloy. The joint gap must, however, be narrow (less than 0.15 mm in width) to allow capillary action to draw the filler metal into the joint. Such narrow joint gaps are usually only found in the manufacturing industry. In the repair industry, especially in I...

The oxidation of both low and high-activity simple and Pt-modified aluminide coatings on nickel base superalloy IN738 has been studied in static air at 1100 OC up to 1000 h. For all coatings oxidation followed a parabolic law up to 400 h. The two Pt-modified coatings showed better protectiveness with lower mass gains and smaller rate constants, especially for long reaction times. The presence o...

In this study, the creep behavior of base metal, weld and heat-affected zone IN738 superalloy welded by pulsed Nd:YAG laser was investigated newly developed small punch testing method in temperature 700 °C under forces 350 N 45N. The results time–displacement showed that aging heat treatment causes a significant increase rupture time compared to casting specimen. This due an volume fraction dec...