The case depth of carburized steel is a function of carburizing time and the available carbon potential at the surface. Both of these have adverse effects on the distribution of residual stress in the case-hardened part. Consequently, a high carbon potential may be suitable for short carburizing times, but not for prolonged carburizing. The Add-On Diffusion Module DICTRA can be used to predict: i the carbon profile and case depth as a function of chemistry, time and distance, and ii the formation of precipitate carbides, as illustrated in this figure for a martensitic stainless steel.
Stainless steels can be susceptible to an intergranular corrosion phenomenon known as sensitization. Sensitization occurs when Cr rich M23C6 carbides precipitate at the grain boundaries. This reduces the local Cr concentration in the matrix adjacent to the precipitate, reducing the corrosion resistance locally. Time-Temperature-Precipitation TTP diagrams are useful for both alloy and process selection, to avoid extensive precipitation of M23C6.
At the nose of the curve, M23C6 needs at least a few minutes to form. This indicates reasonable resistance to sensitization, as a weld or a solution heat treatment could be cooled fast enough to avoid M23C6 precipitation.
Read now. Watch now. The importance of steel chemistry and thermal history on the sensitization behavior in austenitic stainless steels: Experimental and modeling assessment. TTC and CCT diagrams are generated for low alloy steel grades based on their chemical composition and initial grain size.
Induction heating. Case hardening. Spray quenching. Controlled cooling. Artificial ageing. Made for induction heat treating Innovative functionalities Fully integrated in the Transvalor suite. Perfectly dedicated to induction heat treating Induction heat treatment simulation provides comprehensive information about temperature gradient from surface to core and also the location of areas where phase transformations occur.
Material database. Phases properties and phases transformation kinetics can be flexibly specified by the user or imported from any source.
Initial data about kinetics of phase transformations for low-carbon steels and phase properties for preliminary simulations can be calculated according to empirical dependences published in different scientific works by using the heat treatment coefficients calculator embedded in QForm. All necessary initial data for heat treatment simulation of low-alloyed steels and carbon steels can be imported from JMatPro software. Bainite and martensite phases are shown.
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