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To investigate the effect of high temperature ageing on the microstructure and mechanical properties of S31042steel,solid solution treatment at 700℃ was carried out for various time from 10to 6 000h.Experimental results showed that the change of mechanical properties is closely related to the amount of precipitated phases.During ageing from 10to 300h,precipitation in the tested steel increases rapidly,and correspondingly,the high temperature yield strength and room temperature hardness of tested steel increase rapidly.Meanwhile,the thickness of the secondary phase on grain boundaries widens sharply and the room temperature Charpy impact absorb energy decreases.Ageing beyond 300h,the precipitation in the steel increases gradually and the precipitates coarsen to a certain extent.The high temperature yield strength of the steel keeps stable,and the room temperature Charpy impact energy and hardness decrease slowly.Ageing beyond 3 000h,the mechanical properties of the steel tend to be stable.The main precipitates are M23C6,NbCrN and NbC in the tested steel.
To investigate the effect of high temperature aging on the microstructure and mechanical properties of S31042steel, solid solution treatment at 700 ° C was carried out for various time from 10to 6 000h. Experimental results showed the change of mechanical properties is closely related to the amount of precipitated phases. During aging from 10to 300h, precipitation in the tested steel increases rapidly, and correspondingly, the high temperature yield strength and room temperature hardness of tested steel increase rapidly. Min, the thickness of the secondary phase on grain boundaries widens sharply and the room temperature Charpy impact absorb energy decreases. Aging beyond 300h, the precipitation in the steel increases gradually and the precipitates coarsen to a certain extent. high temperature yield strength of the steel keeps stable, and the room temperature Charpy impact energy and hardness decrease slowly .Ageing beyond 3 000h, the mechanical properties of the steel tend to be st able. The main precipitates are M23C6, NbCrN and NbC in the tested steel.