Fatigue & fracture characterization of modified 403 martensitic stainless stell

Objectives:

The proposed project aims at evaluating the deformation, fracture and fatigue behavior of modified 403 matensitic stainless steel material from sub-zero to reactor operation temperature. This tests will be conducted in the temperature range of -60o C to 300oC. The actual material grade data and a better understanding of the toughness, fracture and fatigue behavior of the MSS-403 will help in assessing the safty margins of coolant channel end-fitting of AHWR/PHWR under pressurized thermal shock loading during refueling operation. In addition to this, tensile, metallurgical investigation such as micro-structural characterization and fractographic examination (of failed specimens) will also be carried out.

Deliverables:

• Material chemistry, micro structure, hardness
• Strength/elongation variation with temperature
• Charpy energy variation with temperature and DBTT
• Fracture toughness variation with temperature
• Coffin-Manson plot for LCF
• FCGR and Paris law constant
• Microstuctural and fractographic examination photograph with explanation

Strain -Life	Fatigue Crack Growth Rate