A new approach to strengthen grain boundaries for creep improvement of a Ni-Cr-Co-Mo superalloy at 950 degrees C

作者：Lee J W; Kim D J; Hong H U^*

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2015, 625: 164-168.

DOI：10.1016/j.msea.2014.12.010

• Electron microscopy
• Nickel based superalloys
• Thermomechanical processing
• Grain boundaries
• Creep
• Dislocations

Damage-tolerant microstructure containing serrated grain boundaries (GBs) has been developed in a solid-solution-strengthened Ni-Cr-Co-Mo superalloy by proprietary thermomechanical treatment. The creep life was found to be 2.8 times longer by mitigation of GB cavitational damage. The factors affecting creep properties at 950 degrees C are discussed in terms of GB strengthening.

• 出版日期2015-2-11