Welding of high strength low alloy steels (HSLA) involves usage of low, even and high strength filler materials (electrodes) than the parent material depending on the application of the welded structures and the avail...Welding of high strength low alloy steels (HSLA) involves usage of low, even and high strength filler materials (electrodes) than the parent material depending on the application of the welded structures and the availability of the filler material. In the present investigation, the fatigue crack growth behaviour of weld metal (WM) and heat affected zone (HAZ) regions of under matched (UM), equal matched (EM) and over matched (OM) joints has been studied. The base material used in this investigation is HSLA-80 steel of weldable grade. Shielded metal arc welding (SMAW) process has been used to fabricate the butt joints. Centre cracked tension (CCT) specimen has been used to evaluate the fatigue crack growth behaviour of the welded joints. Fatigue crack growth experiments have been conducted using servo hydraulic controlled fatigue testing machine at constant amplitude loading (R=0).A method has been proposed to predict the fatigue life of HSLA steel welds using fracture mechanics approach by incorporating influences of mismatch ratio (MMR) and notch location.展开更多
Pr2FeCrO6 perovskite crystallizes in an orthorhombic structure with R3c space group. Magnetic stuay nas revealed that Pr2FeCrO6 exhibits room-temperature ferromagnetism with a Curie temperature of about 562 K. Pr2FeCr...Pr2FeCrO6 perovskite crystallizes in an orthorhombic structure with R3c space group. Magnetic stuay nas revealed that Pr2FeCrO6 exhibits room-temperature ferromagnetism with a Curie temperature of about 562 K. Pr2FeCrO6 also exhibits weak ferroelectricity. Thus, given its ferroelectric and ferromagnetic na- ture, the Pr2FeCrO6 material can be considered as a multiferroic. In addition, due to its high Curie temperature and multiferroicity, it could be a promising candidate for spintronics applications.展开更多
文摘Welding of high strength low alloy steels (HSLA) involves usage of low, even and high strength filler materials (electrodes) than the parent material depending on the application of the welded structures and the availability of the filler material. In the present investigation, the fatigue crack growth behaviour of weld metal (WM) and heat affected zone (HAZ) regions of under matched (UM), equal matched (EM) and over matched (OM) joints has been studied. The base material used in this investigation is HSLA-80 steel of weldable grade. Shielded metal arc welding (SMAW) process has been used to fabricate the butt joints. Centre cracked tension (CCT) specimen has been used to evaluate the fatigue crack growth behaviour of the welded joints. Fatigue crack growth experiments have been conducted using servo hydraulic controlled fatigue testing machine at constant amplitude loading (R=0).A method has been proposed to predict the fatigue life of HSLA steel welds using fracture mechanics approach by incorporating influences of mismatch ratio (MMR) and notch location.
文摘Pr2FeCrO6 perovskite crystallizes in an orthorhombic structure with R3c space group. Magnetic stuay nas revealed that Pr2FeCrO6 exhibits room-temperature ferromagnetism with a Curie temperature of about 562 K. Pr2FeCrO6 also exhibits weak ferroelectricity. Thus, given its ferroelectric and ferromagnetic na- ture, the Pr2FeCrO6 material can be considered as a multiferroic. In addition, due to its high Curie temperature and multiferroicity, it could be a promising candidate for spintronics applications.
