Relationship between time to reach Monkman–Grant ductility and rupture life

Phaniraj, C.; Choudhary, B.K.; Rao, K. Bhanu Sankara; Raj, Baldev

doi:10.1016/s1359-6462(03)00021-6

Cited by 62 publications

(29 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The straight line of the ex-service material is situated below the straight line of the virgin material, with a trend for coincidence at low rupture times, but diverging progressively downwards for higher rupture times. This is a reflection of the higher value of m of the ex-service material (1.1872) in relation to the virgin material (1.0356), which implies loss of creep ductility of the material when exposed to service conditions [7]. Figure 8d shows the same kind of comparison in relation to the parameterized Monkman-Grant data of both materials.…”

Section: Methodsmentioning

confidence: 61%

CREEP BEHAVIOR OF 1Cr0.5Mo STEEL . PART 2 – CHARACTERIZATION AND DATA PARAMETERIZATION IN THE EX-SERVICE CONDITION

Bueno¹

2018

ABM Proceedings

View full text Add to dashboard Cite

Constant stress testing was used for characterization of creep behavior of a 1Cr0.5Mo steel plate in the ex-service condition. The tests were performed on creep machines equipped with Andrade-Chalmers type profiles, high sensitivity SLVC transducer extensometry, high stability temperature controllers, and facilities for monitoring the creep curves with an automatic data logging system. Ten creep machines of this type were used in this research, in an experimental work that lasted for one year. Three temperature levels were selected: 538, 565 and 593°C, with stress in the range from 52 to 224 MPa producing rupture times varying from 5 to about 3950h. The creep curves were all followed with great scrutiny using data logger scanning rates which enabled storing thousands of readings in each case. The experimental analysis involved measurements of minimum creep rate, rupture time and final elongation at rupture. The data were analyzed according to the classical phenomenological / physical relations (Norton, Arrhenius, Zenner-Hollomon, Monkman-Grant) and also considering five traditional parameterization methodologies (

show abstract

Section: Methodsmentioning

confidence: 61%

CREEP BEHAVIOR OF 1Cr0.5Mo STEEL . PART 2 – CHARACTERIZATION AND DATA PARAMETERIZATION IN THE EX-SERVICE CONDITION

Bueno¹

2018

ABM Proceedings

View full text Add to dashboard Cite

show abstract

“…1) as the time at which the useful secondary creep strain is exhausted along the creep curve. Further, t MGD is the time at which true tertiary creep sets in and the creep damage attains a critical level [8,9]. Beyond t MGD , accelerated growth of damage leads to failure.…”

Section: Relationship Between Time To Reach Monkman-grant Ductility Amentioning

confidence: 99%

“…In other words, t MGD conceptually divides the creep curve into safe-unsafe regions. Based on this concept and using the continuum creep damage mechanics (CDM) approach [14][15][16][17][18], a creep damage criterion [8,9] applicable for creeping solids has been recently proposed in the form of a relation between t MGD and t r that depends only on the creep damage tolerance factor λ. It is important to mention that λ is a significant parameter that assesses the susceptibility of a material to localised cracking at strain concentrations [18].…”

Section: Relationship Between Time To Reach Monkman-grant Ductility Amentioning

confidence: 99%

“…9Cr-1Mo steel is an important structural material for steam generator applications in thermal and nuclear power generating industries. Apart from these, the paper also discusses the applicability of recently proposed creep damage criterion [8,9], which is based on the seminal concept of time to reach Monkman-Grant ductility t MGD (where Monkman-Grant ductility, "MGD" is the product of ε · s and t r ). t MGD is the time at which the useful secondary creep ductility is exhausted and damage attains a critical level.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interesting relationships for creep deformation and damage and their applicability for 9Cr-1Mo ferritic steel

Choudhary

Phaniraj

Raj

2010

Trans Indian Inst Met

Self Cite

View full text Add to dashboard Cite

The paper presents the validity of several interesting relationships examined for better understanding of creep behaviour of 9Cr-1Mo ferritic steel. Creep rate-rupture time relationships of Monkman-Grant type have been found to be valid. Like stress dependence of creep rate and rupture life, both Monkman-Grant and modified Monkman-Grant relations (MGR and MMGR) exhibited distinct constant values of C MG and C MMG , respectively for low and high stress regimes. The validity of MGR and MMGR is a consequence of the creep deformation behaviour of 9Cr-1Mo ferritic steel obeying first order kinetics. On the basis of creep rate-rupture time relationships of Monkman-Grant type, several other relationships involving transient and tertiary creep parameters have been evolved and their applicability have been examined for the steel. Analogous to MGR and MMGR, a relationship involving transient creep parameters and the other involving tertiary creep parameters were found to be valid. Further, 9Cr-1Mo steel obeyed a recently introduced critical damage criterion interrelating time to reach MonkmanGrant ductility with rupture life, and the criterion depends only on creep damage tolerance factor. This unique relationship is evolved based on the seminal concept of time to reach Monkman-Grant ductility as the time at which the useful safe creep life is exhausted and damage attains a critical level. The important implications of this concept have been discussed.

show abstract

“…Detailed analysis of strain-time creep data in terms of unified approach and first order kinetics resulted in obtaining master creep curves (one interrelating transient creep and secondary creep and another interrelating tertiary creep and secondary creep) and new creep rate-time relationships of Monkman-Grant type [11,12]. Recently, a creep damage criterion has been introduced based on the seminal concept of time to reach Monkman-Grant ductility (the product of creep rate and rupture time) as the time where the secondary creep ductility is exhausted along the creep curve, the true tertiary creep sets in and damage attains a critical level [13]. The critical creep damage criterion was obtained using Continuum Damage Mechanics (CDM) approach, Material's Properties Council (MPC)-Omega approach and θ-Projection method, interrelating the time to reach Monkman-Grant ductility with rupture life that depends only on damage tolerance factor [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A perspective on creep and fatigue issues in sodium cooled fast reactors

Raj

Choudhary

2010

Trans Indian Inst Met

Self Cite

View full text Add to dashboard Cite

Development of advanced materials alongwith improved high temperature mechanical properties, particularly creep and fatigue are important and play a major role for the successful development of robust, safe and economical sodium cooled fast reactor (SFR) technology. The components of SFRs operate in demanding environments at high temperatures under complex creep, fatigue and creep-fatigue loading conditions. Based upon the service requirements in terms of different environments, temperature and loading conditions, different materials are chosen for different components. Ti modified 15Cr-15Ni austenitic stainless steel is chosen for clad and wrapper tubes in the reactor core, which experience high fast neutron flux of ~ 10 15 ncm -2 s -1 along with high temperatures. Type 316L(N) SS is used for out-of-core structural components like main and inner vessels, and sodium pipelines. For steam generators, modified 9Cr-1Mo steel is chosen for all the components, where liquid sodium and steam/water coexist. Some of the important experiences and exciting achievements in the areas of in-house materials development and its characterization in terms of creep, low cycle fatigue and creep-fatigue properties important to design of reactor components for core, out-of-core and steam generator applications are described in the paper. Future directions for materials research and development activities involving critical issues like radiation damage resistance along with improved mechanical properties for advanced clad and wrapper materials necessary for achieving high fuel burnup and design life up to 60 years for out-of-core structural components leading to economical nuclear energy have been highlighted.

show abstract

Relationship between time to reach Monkman–Grant ductility and rupture life

Cited by 62 publications

References 10 publications

CREEP BEHAVIOR OF 1Cr0.5Mo STEEL . PART 2 – CHARACTERIZATION AND DATA PARAMETERIZATION IN THE EX-SERVICE CONDITION

CREEP BEHAVIOR OF 1Cr0.5Mo STEEL . PART 2 – CHARACTERIZATION AND DATA PARAMETERIZATION IN THE EX-SERVICE CONDITION

Interesting relationships for creep deformation and damage and their applicability for 9Cr-1Mo ferritic steel

A perspective on creep and fatigue issues in sodium cooled fast reactors

Contact Info

Product

Resources

About