Effect of Helium on High Temperature Properties of 2¼Cr-IMo and Type 316 Stainless Steels

Byoung Whie LEE
1970 Transactions of the Iron and Steel Institute of Japan  
Synopsis The tensile, rupture, and creep tests were made in air and in helium on 2tCr-1Mo steel at 1100°F and TyjJe 316 steel at 1200°F. The helium chamber and the method Jor creep tests in helium atmosphere were described. From the results, the relative effects oj helium were discussed. For 2iCr-1Mo steel, whichJorms noncoherent oxide scale in air, the comjJarative effect oj helium was to increase the creep resistance at stresses below 6 600 psi and to decrease the creep resistance at stresses
more » ... istance at stresses above 6600 psi. However, Jor Type 316 steel, whichJorms coherent oxide scale in air, the creej) strength was reduced in helium. The dejJCIzdence oj the creej) stress on minimum creep rate in helium and in air were discussed in terms oj strain hardming mechanisms.
doi:10.2355/isijinternational1966.10.325 fatcat:wwsdxokafrbjrewrbddbh43xju