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Effect of thermal ageing on the evolution of microstructure and degradation of hardness of 2.25Cr-1Mo steel

Jha B. B., Mishra B. K., Satpati B., Ojha S. N.

Materials Science Poland

2010

Vol. 28, No. 1

335--346

Thermal ageing of various durations and at various temperatures was performed in order to understand microstructural changes associated with precipitation and coarsening of carbides in 2.25Cr-1Mo steel. The severity of thermal ageing is expressed in terms of the Larson-Miller parameter (LMP). The microstructural examinations were carried out by optical and scanning electron microscopy techniques. A transmission electron microscope (TEM) and an electron probe micro analyzer (EPMA) were used to identify the carbide particles, and to analyse the shape, size and distribution of the precipitate phases. Influence of these precipitates on hardness degradation of the steel has been examined. The reasons for the variation in the microstructure and for the hardness degradation of steel arising from thermal ageing are discussed.

Shock waves in non-ideal fluids

Ojha S. N.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 2

445-464

The problem of propagation of shock waves in non-ideal fluids has been discussed. In the course of discussion, the similarity solution method developed by Sedov has been used. The effects due to geometry of the motion, presence of magnetic field and rotation of the fluid on the propagation of shock waves have been discussed separately. The effects of radiation and viscosity have not been taken into account.