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The Cooling Rate Effect on the Buckling Strength and Elastic Properties of Heated Martensitic Stainless Steel Columns

The buckling strength of slender columns its important property especially for columns that subjected to axial compressive forces. In this paper, we study the effect of cooling rate after heating over (Ac3) for martensitic stainless steel columns on the buckling strength and elastic properties for different type of fixing for column. The results show that the best buckling strength occurs when using very slow cooling rate (inside furnace), that the buckling strength increased about (31%) and elastic modulus increased about (25%) because the slow cooling increase the formation of pearlitetic microstructure that had high strength and good elastic properties . The very fast cooling rate (in salt water) decreased the buckling strength about (46%) and elastic modulus about (51%) because the fast cooling rate increase the formation of martensitic microstructure that had high hardness and low buckling strength and low elastic properties.