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Quenching, being an important process for producing steel components with reliable mechanical properties and service requirement, is characterized with rejects, production hour losses, reworking and induced thermal stresses leading to cracking. This paper investigated thermal behaviour of cylindrical NST 37-2 steel during quenching process using oil as quenchant. A proposed model based on two dimensional energy and heat transfer equation was developed. The form of this equation is obtained using the formula for heat conduction in a steel rod (NST-37-2 steel) and the rate of heat transfer with respect to time and then solving partial differential equation using the finite element method and the numerical computation was done using MATLAB R2010a. A steel bar made of material having constant thermal conductivity was considered, letting the length be l and the breadth be r, constant thermal conductivity k and T representing the various temperature ranges distributed throughout the cylindrical rod at various elemental nodes, some logical assumptions such as: the material being a cylindrical steel rod, hence justifying use of cylindrical coordinate system, all points in the steel rod are assumed to be isothermal just before quenching begins, variation of temperature at different points in the material after quenching, rate at which heat is lost to the quenchant (oil), the direction of heat flow is assumed to be both radial and linear, the surface area gridded into nodes both in the radial and directions (50 nodal points for this case). Results observed indicates that temperature drops rapidly in the early cooling period and as the cooling period progresses, the decrement in temperature attains almost steady state with advancing cooling time in NST 37-2 steel.

Development of a 2-Dimensional Model of Temperature Distribution in NST 37-2 Steel Quenched in Oil Using MATLAB.