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98437 Properties and Corrosion Resistance Behaviour of a New Nitride-Strengthened Nickel-Chromium Superalloy

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Product Number: 51300-98437-SG
ISBN: 98437 1998 CP
Author: U.Brill, D.C.Agarwal
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The nitrogen content of Ni-base superalloys for high temperature service is generally kept below about 0.05 wt.-% to avoid detrimental precipitation of nitrides. These nitrides are said to have a harmful influence on mechanical properties of these alloys. Some recent studies and research conducted with nitrogen strengthening of Ni-Cr-alloys have resulted in an alloy with excellent mechanical properties along with superior high temperature corrosion behaviour. The applied PESR (gressurized Electro-Slag Remelting)-technology provided up to 1.0 wt.-% nitrogen in a NiCr7030-alloy, having a typical chemistry of 2.5 wt.-% silicon, 30 wt.-% chromium, 0.2 wt.-% yttrium, 0.8 wt.-% nitrogen, balance nickel. The homogeneously distributed nitrides prevent the alloy from excessive grain growth thus providing stable mechanical properties. i.e. impact toughness even after long term exposure. The new alloy exceeds easily Rm104 = 10 MPa ( 1.5 ksi ) at 1000 °C ( 1832 °F ) and has a metal loss less than 0.10 g/m2h in cyclic oxidation tests performed at 1100 °C ( 2012 °F ) over about 1000 hours duration. The evaluated properties so far make this alloy a very suitable and attractive candidate for aerospace applications such as flying gas turbine components. More data on various other high temperature degradation phenomena and fabricability are under development and will be presented in the fi.rture. This paper introduces this new alloy with some of it’s physical, mechanical and oxidation resistance properties. Keywords: Nitrogen-strengthened, Ni-Cr-Superalloys, creep properties, corrosion resistance, gas turbines, gas turbine components
The nitrogen content of Ni-base superalloys for high temperature service is generally kept below about 0.05 wt.-% to avoid detrimental precipitation of nitrides. These nitrides are said to have a harmful influence on mechanical properties of these alloys. Some recent studies and research conducted with nitrogen strengthening of Ni-Cr-alloys have resulted in an alloy with excellent mechanical properties along with superior high temperature corrosion behaviour. The applied PESR (gressurized Electro-Slag Remelting)-technology provided up to 1.0 wt.-% nitrogen in a NiCr7030-alloy, having a typical chemistry of 2.5 wt.-% silicon, 30 wt.-% chromium, 0.2 wt.-% yttrium, 0.8 wt.-% nitrogen, balance nickel. The homogeneously distributed nitrides prevent the alloy from excessive grain growth thus providing stable mechanical properties. i.e. impact toughness even after long term exposure. The new alloy exceeds easily Rm104 = 10 MPa ( 1.5 ksi ) at 1000 °C ( 1832 °F ) and has a metal loss less than 0.10 g/m2h in cyclic oxidation tests performed at 1100 °C ( 2012 °F ) over about 1000 hours duration. The evaluated properties so far make this alloy a very suitable and attractive candidate for aerospace applications such as flying gas turbine components. More data on various other high temperature degradation phenomena and fabricability are under development and will be presented in the fi.rture. This paper introduces this new alloy with some of it’s physical, mechanical and oxidation resistance properties. Keywords: Nitrogen-strengthened, Ni-Cr-Superalloys, creep properties, corrosion resistance, gas turbines, gas turbine components
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