Effect of Cold Deformation on the Time Rupture Strength and Creep Rate of Some High Temperature Resisting Austenitic Steels.

Experimental data are presented for creep tests at 650C for 6000 hr on steels X 10 NiCrAlTi 32. 20, X 8 CrNiMoNb 16. 16, and X 10 NiCrMoTib 15. 15 which were solution annealed and then cold worked 0 to 60%. Data are plotted as a function of degree of deformation. Metallographic investigations indicate that the effects of cold work are due to formation of a substructure strengthened by very fine carbide precipitation.