Characterisation of microstructure and its effect on the strength and toughness of 17-4PH stainless steel Online publication date: Sat, 19-Sep-2009
by C.R. Das, A.K. Bhaduri, S.K. Albert, A. Dasgupta
International Journal of Nuclear Energy Science and Technology (IJNEST), Vol. 4, No. 4, 2009
Abstract: The influence of microstructure on the strength and toughness of 17-4 Precipitation-Hardened (PH) Stainless Steel (SS) was studied as a function of duration of ageing at 783 K. Lath martensite is formed in this steel in its solution-annealed condition. X-ray diffraction studies detected the formation of a copper-rich phase after ageing for 0.25 h, with the amount of the copper-rich precipitates increasing with the duration of ageing. The coarsening of the copper-rich precipitates on ageing for 2 h led to a sharp decrease in hardness, which was attributable to the transformation of the coherent copper-rich body centred cubic (b.c.c.) phase to the incoherent copper rich face centred cubic (f.c.c.) phase. Further ageing for 4 h led to a dip in hardness and strength and an increase in toughness. The dip in hardness upon long-term ageing could be attributed to the formation of coarse copper-rich precipitates, which also led to an improvement in the toughness of the material.
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