Friction stir processing of martensitic stainless steel: an alternative to quench and tempering treatment for cutting tools?
- Gesto D. ,
- Verdera D. ,
- Gonzalez M. ,
- et al
- Gesto D. ,
- Verdera D. ,
- Gonzalez M. ,
- de Labra I. ,
- Alvarez A.I. and
- Pena G.
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Description
Annealed AISI 420 martensitic stainless steel (0.46%C, 0.3%Mn, 13.8%Cr) sheets (thickness 3 mm) were subjected to dry or wet friction stir processing (FSP) and the correlation between microstructure, hardness and process parameters was investigated. FSP experiments were conducted using an MTS PDS-4 iSTIR machine under position control with a WC-Co tool at a rotational speed of 575 rpm and a traverse speed of 50 mm/min. Wet tests were undertaken in a water tank. Steel surfaces were modified before FSP by laser hardening with a direct diode laser mounted on a 6-axis robot system. Specimen microstructure was observed by optical microscopy and average grain size was determined using an image analysis program. Microhardness was measured with an EMCO-TEST Durascan machine. Issues discussed include the use of FSP as an alternative to quenching and tempering treatment in 420 steels, grain size refinement in the central martensitic zone, and WC-Co tool wear.
9th International Symposium, 15-17 May 2012, Session 11B: High Temperature FSW II, Paper 03
Subjects
- Surface engineering
- Process
- Friction stir processing
- Stainless steels
- Ferrous
- Material
- Martensitic stainless steels
- Weld zone
- Weld
- HAZ
- Thermomechanically affected zone
- Process conditions
- Heat treatment
- Microstructure
- Mechanical properties
- Properties
- Hardness
- Grain
- Environment
- Underwater environment
- Dynamically recrystallised zone
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