Influence of srtuctural state on cavitational erosion of martensitic stainless steel quenching and laser hardened

Abstract

The paper continues the previous researches of the author, on the same topiccavitation erosion- researches which ended with a Ph.D. thesis and through other works Samples of the martensitic stainless steel have been thermally treated and tested under cavitation erosion. There have been obtained modifications of the cavitational resistance dependent on the thermal treatment by use of structural analyses and micro hardness tests the influence of microstructure on the steel cavitation resistance had been stressed out. The thermal treatment of quenching + high tempering (Q + TH), followed by quenching + high tempering + laser hardened (Q + TH + LQ) or by quenching + high tempering + superficial laser quenching + low tempering (Q + TH + LQ + TL) give a high cavitational erosion resistance to martensitic stainless steel.