Abstract
Maraging steels are ferrous alloys with Ni, Co, Mo, and Ti additions. These materials are a special class of ultra high mechanical strength steels with wide and special applications in strategic areas, which makes their knowledge very valuable. Computational advances allowed to analyze the behavior of these materials numerically, using the finite element method and developing mathematical models that can represent numerically its mechanical behavior. The present work has the objective of surveying the mechanical properties of maraging steels 300 and 350 by slow strain rate tensile (SSRT) tests, after the solution treatment at 1183K for 1h. Additionally, it was evaluated the hydrogen embrittlement in samples tested by SSRT under cathodic protection with a potential -1.2 VSCE in 3.5% NaCl solution. The study was complemented with detailed fractographic analysis. This work also presents the analysis of representative models by use of Hollomon, Swift, Voce and coupled Swift-Voce equations to describe the strain-hardening behavior. Compared to the others, the Voce’s model was the one which best fitted the experimental results, with values of R2 higher than 0.992. Through the variation of the chemical composition found in the different grades of maraging steels, this work contemplates the creation of a generalized Voce model based on the variation of the Ti content. The work concludes presenting the generalized Voce model proposed and a numerical analysis of the SSRT results with a good accuracy of the strain-hardening response.
Highlights
IntroductionIn the solution treatment (ST) condition, maraging steels exhibit great ductility and toughness as a result of the formation of a body-centered cubic (BCC) martensitic structure
Maraging steels have excellent mechanical properties and recent studies point to significant improvements in their specific properties with the combination of surface treatments available for numerous purposes: protection against surface corrosion, resistance to embrittlement by hydrogen, increase in hardness, reduction wear, among other applications[1,2,3,4].In the solution treatment (ST) condition, maraging steels exhibit great ductility and toughness as a result of the formation of a body-centered cubic (BCC) martensitic structure
Based on the maraging steel specimens tested, the results show that the solution treatment in maraging 300 and 350 steels provides, as a general result, samples showing some ductility during the tests
Summary
In the solution treatment (ST) condition, maraging steels exhibit great ductility and toughness as a result of the formation of a body-centered cubic (BCC) martensitic structure. This treatment is performed above the final temperature of the martensite to austenite transformation, remaining long enough to place all the alloying elements in solid solution, besides promoting residual stress relief . It was observed that increasing the titanium content of maraging steels increases its strength and decreases plasticity and ductility. Studies suggest this element is the most effective strengthening agent in maraging steels. Efforts may be employed to generate models which describes the strain-hardening behavior in these materials
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