Cavitation erosion resistance of active screen-low temperature plasma nitrided AISI 410 martensitic stainless steel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Authors

Colleges, School and Institutes

External organisations

  • Universidade de Sao Paulo - USP
  • Heat Tech Technology for Heat Treatment and Surface Engineering Ltd.

Abstract

AISI 410 martensitic stainless steel specimens were low temperature plasma nitrided at 400°C in a mixture of 75%N2:25%H2, during 20 h. Active screen technic was used to avoid any edge effect. The nitrided case is composed of expanded martensite (α'n) and ε-Fe3N iron nitride, whilst chromium nitride precipitation was avoided. Surface hardness reached 1275 HV0.01. The transverse microhardness profile shows a gentle hardness gradient with a NHT nitrided case depth of 28 μm. The cavitation erosion mass losses were measured as a function of exposure time. The results showed a decrease of 27 times of the mass loss compared to the non-nitride specimens. Wear rate decreased from 2.56 mg/h for the non-nitrided condition to 0.085 mg/h after nitriding. Such results showed that low temperature plasma nitriding and the formation of expanded martensite are effective to increase cavitation erosion resistance of AISI 410 stainless steel.

Details

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014
Publication statusPublished - 1 Jan 2014
EventMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014 - Pittsburgh, United States
Duration: 12 Oct 201416 Oct 2014

Conference

ConferenceMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014
CountryUnited States
CityPittsburgh
Period12/10/1416/10/14

Keywords

  • Active screen plasma nitriding, Cavitation erosion, Martensitic stainless steel