Patent ID: 9670787
Date: 2017-06-06
CPC Classifications: C22C,C22F,F01D,F05D

Claim:
1. A Ti—Al-based heat-resistant member comprising a Ti—Al-based alloy which comprises: 28.0 mass % to 35.0 mass % of Al; 1.0 mass % to 15.0 mass % of at least one selected from the group consisting of Nb, Mo, W and Ta; 0.1 mass % to 5.0 mass % of at least one selected from the group consisting of Cr, Mn and V; and 0.1 mass % to 1.0 mass % of Si, with the balance being Ti and unavoidable impurities, wherein a whole or a part of a surface of the Ti—Al-based heat-resistant member includes a hardened layer as a surface layer, said hardened layer having a higher hardness than an inside of the Ti—Al-based heat-resistant member, and the Ti—Al-based heat-resistant member has a hardness ratio represented by the following expression (a) of 1.4 to 2.5: in which HV HV