Examination of fatigue and creep–fatigue crack growth behaviour of aged type 347 stainless steel weld metal at 650°C

Gladwin, D. N.; Miller, David A.; Priest, R. H.

doi:10.1179/mst.1989.5.1.40

Cited by 18 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although the inclusion of a dwell period into the cyclic tests has clearly enhanced cyclic crack growth rates above those measured during pure fatigue testing, no consistent hold period trend is apparent for the creep-fatigue tests. This is in contrast to the data obtained on 347 weld metal [2] where progressively faster cyclic growth rates were obtained with increasing hold period durations.…”

Section: I93contrasting

confidence: 99%

“…observation of creep damage in the creep fatigue test specimens, led to the decision to characterise crack growth contributions in terms of separated cyclic and dwell components. This is consistent with the approach used previously [1,2].…”

Section: I93supporting

confidence: 93%

“…This equation reflects the observation that, unlike the 347 weld data [2], no progressive hold time dependence for the cyclic contributions to crack growth is apparent.…”

Section: Discussionmentioning

confidence: 72%

“…It should be remembered that in order to calculate C* for the feature weld specimens, detailed finite element analyses were required in order to obtain anf( a / W ) calibration for use in equation (4), see Section 3. Previously, it was shown that for tests on 347 welds [2] and 321 parent material [I] compact tension specimens, the reference stress (a,,) approximation to C* [5] could be conservatively used to represent creep crack contributions to growth, where and In equation (7), irer is the creep at the reference stress, orsf. The creep rate during relaxation for 321 stainless steel was obtained from the approximation ire, = B' o,,/Et, where B' = 0.055, orCC is the reference stress at the start of the dwell and t is the time into the dwell [ti].…”

Section: Discussionmentioning

confidence: 99%

“…Recently, the crack growth response of 321 stainless steel plate and of 347 stainless steel weld metal has been quantified under creep, fatigue and creep-fatigue conditions at 650°C [1,2]. This work was performed on standard compact tension specimens in order to simplify the characterisation of crack growth rates in terms of the relevant fracture mechanics parameters (i.e.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Crack Growth Rates During Creep, Fatigue and Creep‐fatigue in an Austenitic Feature Weld Specimen

Gladwin

Miller

Priest

1989

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

Static creep crack growth tests and displacement controlled fatigue and creep-fatigue crack growth tests have been performed on austenitic feature weld specimens at 650°C. The creep-fatigue tests incorporated hold times of up to 96 h. During these tests, crack growth appeared to comprise cyclic and dwell components. Cyclic crack growth components were characterised by the fracture mechanics parameter K whilst creep crack growth contributions were correlated with C * . In order to determine K and C* for the non-standard feature weld specimen, elastic and elastic-plastic creep finite element analyses were conducted. Good correspondence is shown between the feature weld data and comparable data from compact tension specimen tests on similar materials. Equations obtained from the compact tension specimen results, which describe total crack growth rates as the sum of the cyclic and dwell contributions, are shown to adequately describe the features test results also. Furthermore, it is demonstrated that a reference stress approach can be used to estimate C* for the features specimens. NOMENCLATURE da/dN = crack growth rate (da /dN), = hold period contribution to crack growth rate during creep-fatigue test (da/dN), = cyclic contribution to crack growth rate during creep-fatigue test a = crack length B =thickness of compact tension specimen C* = creep crack growth correlating parameter E = Young's modulus J = non-linear elastic fracture mechanics parameter K = stress intensity factor ,f'(a/W) = C* calibration AKeK= stress intensity factor range for which cracks are open AK,,, =total stress intensity factor range P = load q, = ratio of load range for which cracks are open to total load range R = ratio of minimum load in cycle to maximum in cycle t = time t,, = hold period duration W =width of specimen Y = compliance function i = creep rate A P = load range = load line displacement rate during creep crack growth u , , = reference stress 187 188 D. N. GLADWIN et al.

show abstract

Section: I93contrasting

confidence: 99%

Section: I93supporting

confidence: 93%

“…This equation reflects the observation that, unlike the 347 weld data [2], no progressive hold time dependence for the cyclic contributions to crack growth is apparent.…”

Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations