INVESTIGATION OF HEAT-RESISTING STEEL FOR GAS TURBINES (V)
1954 Volume 40 Issue 10 Pages 1007-1011
Details
1954 Volume 40 Issue 10 Pages 1007-1011
In the heat resisting steel, the W and Mo were often used for the purpose of elevation of the creep strength in high temperature. The authors studied the effect of W, Mo and (W+Mo) contents on the aging of Ni-Cr-Co austenitic heat-resisting steel containing 15% Ni, 20% Cr and 15% Co.
The authors first examined the change of their hafdness due to various heat treatments of each sample: i, e. tbe solid-solution treatment and aging, and then observed the microstructure.
As results of these experiments, the most moderate composition and heat treatment for Ni-Cr-Co austenitic heat-resisting steel were found. The optimum conditions were as follows: (1) The most suitable composition, W 3.0-5.0%, Mo 3.0-5.0%, W+Mo (3+5-(5+3)%; (2) the treatment at 1200-1250°C, for the solution treatment, and 700-750°C, for the aging temperature, and the aging time for 6-12 hours.
