Strengthening behaviour and embrittlement phenomena in Fe-Ni-Mn-(Ti) maraging alloys

Microstructural evolution of Mn-based maraging steels and their influences on mechanical properties

“…The average precipitate size was measured as 7.4 nm and the interpartical spacing is ~40 nm. Taking [19], [44], [45] and , the calculated is 1258 MPa which is in good agreement with the experimental value (~1250 MPa). As a result of precipitation strengthening, the peakaged sample exhibits a better work hardening compared to the sample in the SHT state ( Figure 12).…”

“…Driven by the motivation to reduce the production costs of maraging steels (a group of precipitation-strengthened AHSS by intermetallic compound instead of carbide), the strategy of substituting expensive alloying elements such as cobalt and nickel with cheaper ones was proposed and Co-free Fe-Mn-(Ni) maraging steels have received increasing attention [15][16] [17][18] [19]. The characterisation of the precipitate and its effect on maraging behaviour have been investigated [15] [20][21] [22][23] [24].…”

Observation of Precipitation Evolution in Fe-Ni-Mn-Ti-Al Maraging Steel by Atom Probe Tomography

“…[7,8] Therefore, Mn additions were introduced, as this element was found to accelerate the age-hardening process and also reduce the required levels of the more expensive Ni additions. [12][13][14][15][16] Remarkably, the best combination of strength and ductility was achieved in a Fe-Ni-Mn-Ti-Al maraging steel after very short aging treatments at 550°C for as little as 5 to 15 seconds. [16] Approximately, 50 pct of the total strength increment from age hardening was achieved during these short aging treatments.…”

“…[15] In seeking to clarify the nature of precipitation at these later stages, we have used electron microscopy in conjunction with atom probe. It is noteworthy that all previous atom probe studies were performed with one-dimensional or threedimensional atom probe field ion microscopes.…”

“…It is noteworthy that all previous atom probe studies were performed with one-dimensional or threedimensional atom probe field ion microscopes. [6,15,16] The recently developed local electrode atom probe [17,18] is more advanced in that it allows collection of data from much larger volumes of material in a shorter period of time. This is important in evaluating precipitate microstructures.…”