Abstract
The supermartensitic stainless steels (SMSS) are a relatively new class of corrosion resistant alloys developed to obtain a better combination of weldability, strength, toughness and corrosion resistance than conventional martensitic stainless steels. The final properties of SMSS are strongly influenced by quenching and tempering heat treatments. In this work, different routes of heat treatments were tested in a Ti-stabilized 12%Cr supermartensitic stainless steel with the objective to improve mechanical properties, specially the low temperature (-46oC) toughness. Double and triple quenching were tested and compared to single quenching heat treatments. Two tempering temperatures (500oC and 650oC) were tested. The results obtained with instrumented Charpy impact tests showed that a triple quenching treatment was able to increase the density of fine TiC particles and improve the mechanical properties of specimens heat treated by quenching and tempering at 650oC.
Highlights
The supermartensitic stainless steels (SMSS’s) have an interesting combination of weldability, strength, toughness and corrosion resistance
The areas of these portions correspond to three distinct energies: After the heat treatments the specimens were machined to the final dimensions of subsize Charpy impact tests (55 x 10 x 7.5 mm) with V notch[6]
The austenite volume fraction of specimens Q1-650, Q2-650 and Q3-650 were determined by magnetization saturation tests following the procedure suggested by Cullity[7] and used in previous works[4,5]
Summary
The supermartensitic stainless steels (SMSS’s) have an interesting combination of weldability, strength, toughness and corrosion resistance. The mechanical properties of martensitic steels are adjusted by quenching and tempering heat treatments. The main results of instrumented Charpy tests are the initiation, propagation and total energies, and the load versus time or deflection curve.
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