Effect of heat treatment on transformation-induced plasticity of economical Cr19 duplex stainless steel

Fabrication of a Novel TRIP‐Aided Ni‐Free Lean Duplex Stainless Steel with Good Corrosion Resistance by Twin‐Roll Strip Casting and Its Deformation Mechanisms

“…The M d 30 temperature, at which half of austenite can be transformed into martensite under plastic deformation with true strain of 0.3, calculated by Equation , can be a criterion for the austenitic stability, Figure b. The lower M d 30 temperature represented the higher austenitic stability . The M d 30 temperature of DSS‐1 was calculated to be about −28.6 °C, which was lower than that of DSS‐2 (21.3 °C), indicating that the austenitic stability of DSS‐1 was higher than that of DSS‐2.…”

“…The austenite islands were embedded in the ferrite matrix. Many annealing twins were observed in austenite phase but they have not been observed in ferrite phase due to the lower stacking fault energy (SFE) of austenite . The grain size of DSS‐1 was similar to that of DSS‐2 but the austenite fraction of DSS‐1 was significantly higher than that of DSS‐2, indicating that the addition of Ni had little influence on the grain size of experimental steels but it can effectively promote the formation of austenite phase.…”

“…Herrera et al and Choi et al have developed the novel 1 GPa TRIP‐aided lean duplex stainless steels and researched the microstructure evolution during plastic deformation. The effects of heat treatment temperature, deformation temperature, and strain rate on these TRIP‐aided stainless steels have been intensively investigated. However, most of the existed studies focus on the mechanical properties of this type of stainless steels but neglect the corresponding corrosion resistance.…”

Investigation on the solution treated behavior of economical 19Cr duplex stainless steels by Mn addition

“…For the true strain above 0.15, the increment slope of the true stress decreased for solution treated specimen compared with as-rolled specimen. Meanwhile, No obvious yield behavior are observed in the shapes of curves with Mn addition higher than 3.6 wt.%, indicating strain hardening occurring with increasing Mn content [26], this is related to dislocation strengthening caused by volume fraction difference of two phases with more Mn addition [27]. The region of uniform elongation for as-rolled and solution treated specimens became much shorter with Mn addition increased to 8.1 wt.%, showing comparatively low plasticity with more austenite formation, which can be attributed to larger deformation strains of austenite than that of ferrite [28].…”

Nitrogen-induced selective high-temperature internal oxidation behavior in duplex stainless steels 19Cr–10Mn–0.3Ni– x N

“…In the past, sufficient amounts of alloy elements such as chromium, molybdenum and nickel were added in conventional DSSs to achieve better pitting resistance in order to meet the requirement of aggressive corrosion environment. Meanwhile, mechanical properties were also always achieved by solid solution hardening of the additional substitutional elements [6]. Recently, lean alloying DSSs, which is nearly nickel/molybdenum free and could exhibit better mechanical properties, is becoming an important subject on developing advanced structural materials in order to meet the exhaustion of natural resources without degrading their corrosion properties [7].…”