Creep Deformation and Fracture Behaviors of Ultra-Purified Ferritic Stainless Steel 429Mo With Nb and Ti Dual Stabilization
- DOI
- 10.2991/icmse-16.2016.31How to use a DOI?
- Keywords
- Ultra-purified ferritic stainless steel, Dislocation climb, Creep resistance, Transgranular fracture
- Abstract
In order to clarify the creep deformation and fracture behaviors of ultra-purified ferritic stainless steel 429Mo for automotive exhaust systems, the creep behaviors of 429Mo steel at 650øC and different applied stress levels were investigated through performing the creep tests and the microstructural observation after creep tests. The results show that the applied stresses have obvious effect on the creep behavior. With increasing the applied stress, the minimum creep rates increase and fracture lives decrease. The creep stress exponent of 4.22 and the observed microstructure indicate that a dislocation climb creep mechanism controls the creep deformation. The second-phase particles as well as the stable sexangle and quadrangle dislocation networks are helpful to improve creep resistance. The creep test data follow the Monkman-Grant relationship and Larson-Millar relationship, which can also be used to predict the creep lifes. The predicting result of the former is more accurate. Both macrographs and micrographs of fracture surfaces indicate that the creep fracture mode is ductile transgranular fracture for the 429Mo steel.
- Copyright
- © 2016, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Cai-Hong Ying AU - Tian-Long Liu AU - Li-Jia Chen AU - Lian-Quan Guo PY - 2016/12 DA - 2016/12 TI - Creep Deformation and Fracture Behaviors of Ultra-Purified Ferritic Stainless Steel 429Mo With Nb and Ti Dual Stabilization BT - Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016) PB - Atlantis Press SP - 182 EP - 187 SN - 2352-5401 UR - https://doi.org/10.2991/icmse-16.2016.31 DO - 10.2991/icmse-16.2016.31 ID - Ying2016/12 ER -