On fracture toughness JIC testing of martensitic stainless steels
The objective of this research is to determine the best conditions to measure the fracture toughness of an ASTM A-743 grade CA-6NM stainless steel used in hydraulic turbine runners. The tests are performed on 12.7 mm and 25.4 mm thick compact tension (CT) specimens. Experimental results show that only the thicker specimen gives a valid test according to ASTM E1820 standard. However, very close crack initiation JIC values are obtained with thinner specimens provided they are side-grooved. Thickness effect is exhibited both on the resistance curve J-Δa and the crack front during the stable crack propagation. This paper is documented with both macroscopic and microscopic descriptions of fracture surfaces in the stable crack extension region.
JIC fracture toughness CA-6NM steel CT specimen thickness constraint effect
Jianqiang Chen Yves Verreman Jacques Lanteigne
école Polytechnique de Montréal,C.P.6079,succ.Centre-ville,Montréal (Québec),Canada H3C 3A7 Hydro-Québec,Institut de Recherche,1800,boul.Lionel-Boulet,Varennes (Québec),Canada,J3X 1S1
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）