A study on life evaluation method of 304 stainless steel under biaxial creep-fatigue condition.

This paper studies the biaxial creep damage of type 304 stainless steel at 923 K. Biaxial tension creep tests were carried out using cruciform specimens and the effect of stress biaxiality on rupture lifetime and creep voiding was discussed. Mises equivalent stress and the equivalent stress based on crack opening displacement were a suitable parameter to assess the biaxial creep damage. The equivalent stress proposed by Huddleston overestimated the biaxial creep damage by more than a factor of two. Stress biaxiality had almost no influence on the orientation of voided grain boundaries and the critical value ofparameter A. Tests of alternative loading direction significantly dispersed the biaxial creep damage resulting in larger creep lifetime.

Download Full-text

Relationship of Creep, Creep-Fatigue, and Cavitation Damage in Type 304 Austenitic Stainless Steel

Journal of Engineering Materials and Technology ◽

10.1115/1.3226443 ◽

1989 ◽

Vol 111 (2) ◽

pp. 123-131 ◽

Cited By ~ 12

Author(s):

Saurin Majumdar

Keyword(s):

Stainless Steel ◽

Hold Time ◽

Strain Range ◽

304 Stainless Steel ◽

Growth Equation ◽

Full Potential ◽

Basic Study ◽

Cavitation Damage ◽

Creep Fatigue ◽

Type 304

Available creep and creep-fatigue data on type 304 stainless steel are re-examined in the light of recently generated basic cavitation data on the same material. This basic study has shown creep damage to be a highly inhomogeneous phenomenon, both in space and in time. A small fraction of boundaries are so intensely cavitated by about 10–25 percent of life that for all practical purposes they can be considered cracked. Other similar boundaries, that are similarly oriented with respect to the tensile stress direction, however, are almost devoid of cavities at the end of life. The early nucleation of cracks by creep mechanism has a significant influence on creep-fatigue interactions, particularly for tests at low strain ranges. A simple ductility exhaustion model appears to be able to account for the early crack initiation. A hardness-modified ductility approach appears to provide an upper bound to the ductility displayed by all tests and correlates data for long hold-time fatigue tests at low strain range. Tests at higher strain ranges and/or shorter hold times do not achieve their full potential ductility because their lives are cut short by crack propagation. Their lives can be predicted empirically by an enhanced fatigue crack growth equation in the presence of cavitation damage.

Download Full-text

Heat-to-heat variations in the fatigue and creep-fatigue behavior of AISI type 304 stainless steel, and the fatigue behavior of type 308 stainless steel weld material

10.2172/4462657 ◽

1973 ◽

Cited By ~ 2

Author(s):

C. R. Brinkman ◽

G. E. Korth

Keyword(s):

Stainless Steel ◽

Fatigue Behavior ◽

304 Stainless Steel ◽

Steel Weld ◽

Stainless Steel Weld ◽

Aisi Type ◽

Weld Material ◽

Creep Fatigue ◽

Type 304 ◽

Type 304 Stainless Steel

Download Full-text