scispace - formally typeset
Search or ask a question
Author

D. Poquillon

Bio: D. Poquillon is an academic researcher. The author has contributed to research in topics: Creep & Intergranular corrosion. The author has an hindex of 2, co-authored 2 publications receiving 19 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the authors present quantitative results on mechanical behaviour and the damage at high temperature of simulated HAZ which show different sensitivities to intergranular cracking, and an inter-granular damage model is identified using the local approach to fracture based on mechanical tests performed at 600 °C and metallurgical observations on smooth specimens and two types of notched specimens.
Abstract: During service at high temperature, stabilized stainless steels are well known to present a serious form of intergranular cracking in the Heat Affected Zones (HAZ) referred to as the reheat cracking phenomenon which is very deleterious for the structural integrity of welds made in this steel. The purpose of the present study is to present quantitative results on mechanical behaviour and the damage at high temperature of simulated HAZ which show different sensitivities to intergranular cracking. Creep laws are determined and an intergranular damage model is identified using the local approach to fracture based on mechanical tests performed at 600 °C and metallurgical observations on smooth specimens and two types of notched specimens.

14 citations

Journal ArticleDOI
TL;DR: In this paper, the authors validate the creep damage model identified using the local approach methodology on notched bar creep tests (Part I) by checking if these damage laws are able to give accurate fracture predictions.
Abstract: Stabilized stainless steels like AISI 321 are well known to present a serious form of intergranular cracking in the HAZ referred to as reheat cracking. The purpose of the present part is to validate the creep damage model identified using the local approach methodology on notched bar creep tests (Part I) by checking if these damage laws are able to give accurate fracture predictions. The comparison between experimental data obtained at 600°C and numerical simulations is made for five different conditions with three different simulated HAZ and on two specimen geometries including CT specimen tested under stress relaxation conditions and sharply notched thin wall tubular specimens tested in torsion (Mode II loading). Both of these specimens have not been used for the identification of the damage model coefficients.

7 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, the random diffusion of solute atoms during transient liquid phase (TLP) bonding of SS 410 and 321 with nickel-based brazing filler alloy BNi-2 have been modeled using Random Walk Modeling technique.

47 citations

Journal ArticleDOI
TL;DR: In this article, the authors combined Monte Carlo simulations of precipitation kinetics in power plant ferritic steels with the continuum creep damage mechanics model to calculate the damage evolution instead of the model equations developed for specific creep damage.
Abstract: Continuum creep damage mechanics modelling of creep has been combined with the recently developed Monte Carlo simulations of precipitation kinetics in power plant ferritic steels. The precipitation simulation has been validated by applying it to a 9 wt-%Cr ferritic steel, P92 and using the microstructural data published in the literature. The microstructural evolution results of precipitation kinetics simulation are used in the continuum creep damage mechanics model to calculate the damage evolution instead of the model equations developed for specific creep damage. This approach has been applied to P92 to study the effects of different creep damage mechanisms on the creep behaviour. Reasonable agreement with experimental creep rupture data and creep curves has been obtained. The new approach shows promise to provide a useful tool for both new alloy development and component life prediction.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of work hardening and aging on Ti(C,N) precipitation, on the mechanical (hardness, tensile and creep) behaviour of the simulated HAZs and on their sensitivity to intergranular crack propagation through stress relaxation tests performed on pre-cracked CT type specimens tested at 600 °C.

30 citations

Journal ArticleDOI
TL;DR: In this article, the effect of multiaxial stress state and pre-straining on the creep properties of 316L(N) stainless steel was investigated and a model taking into account both prestrain and multiaxonial effects was developed and identified on the basis of local intergranular micro-cracks measurements on notched specimens.

18 citations

Journal ArticleDOI
TL;DR: In this article, the authors present quantitative results on mechanical behaviour and the damage at high temperature of simulated HAZ which show different sensitivities to intergranular cracking, and an inter-granular damage model is identified using the local approach to fracture based on mechanical tests performed at 600 °C and metallurgical observations on smooth specimens and two types of notched specimens.
Abstract: During service at high temperature, stabilized stainless steels are well known to present a serious form of intergranular cracking in the Heat Affected Zones (HAZ) referred to as the reheat cracking phenomenon which is very deleterious for the structural integrity of welds made in this steel. The purpose of the present study is to present quantitative results on mechanical behaviour and the damage at high temperature of simulated HAZ which show different sensitivities to intergranular cracking. Creep laws are determined and an intergranular damage model is identified using the local approach to fracture based on mechanical tests performed at 600 °C and metallurgical observations on smooth specimens and two types of notched specimens.

14 citations