The present study deals with the development of a low carbon high strength steel by thermomechanical controlled processing on a pilot scale.The continuous cooling transformation has yielded a flat top "C" cu...The present study deals with the development of a low carbon high strength steel by thermomechanical controlled processing on a pilot scale.The continuous cooling transformation has yielded a flat top "C" curve with the phase field occupied by a mixture of bainite and martensite.The microstructure of water quenched steel essentially consists of highly dislocated lath martensite along with fine (Ti,Nb)CN precipitates and twins.High strength steel with 1217-1298 MPa yield strength and 1372-1513 MPa ultimate tensile strength along with 16-12% total elongation has been obtained in the range of 850 to 750℃ finish rolling temperature.The impact toughness value in the range of 45-72J was also achieved in the present steel.展开更多
Field studies from industrial belts in Calcuttahave been carried out with 130 male workersaddicted to tobacco habits.Blood samples havebeen collected with detailed history of tobaccoaddiction i.e.type and duration Chr...Field studies from industrial belts in Calcuttahave been carried out with 130 male workersaddicted to tobacco habits.Blood samples havebeen collected with detailed history of tobaccoaddiction i.e.type and duration Chromosomalalterations with SCE following leucocyte culture and changes in genetic mackers following PAGE have been studied from these samples.展开更多
文摘The present study deals with the development of a low carbon high strength steel by thermomechanical controlled processing on a pilot scale.The continuous cooling transformation has yielded a flat top "C" curve with the phase field occupied by a mixture of bainite and martensite.The microstructure of water quenched steel essentially consists of highly dislocated lath martensite along with fine (Ti,Nb)CN precipitates and twins.High strength steel with 1217-1298 MPa yield strength and 1372-1513 MPa ultimate tensile strength along with 16-12% total elongation has been obtained in the range of 850 to 750℃ finish rolling temperature.The impact toughness value in the range of 45-72J was also achieved in the present steel.
文摘Field studies from industrial belts in Calcuttahave been carried out with 130 male workersaddicted to tobacco habits.Blood samples havebeen collected with detailed history of tobaccoaddiction i.e.type and duration Chromosomalalterations with SCE following leucocyte culture and changes in genetic mackers following PAGE have been studied from these samples.
