The effect of Ti precipitates on hydrogen embrittlement of Fe–18Mn–0.6C–2Al–xTi twinning-induced plasticity steel

The advantage of grain refinement in the hydrogen embrittlement of Fe–18Mn–0.6C twinning-induced plasticity steel

“…2a). Instead, the 2nd peak, which is known to be generated by hydrogen atoms detrapped from twin boundaries [16,28], newly appeared at temperatures ranging between approximately 500 K and 600 K. This result implies that hydrogen atoms were transported from grain boundaries, dislocations, and lattices (the 1st peak) to twin boundaries (the 2nd peak) during the SSRTs, which shows good agreement with previous results obtained using other TWIP steels [16,31] and austenitic stainless steels [28,29]. The height of the 2nd peak increased with increasing grain size, implying that the migration of hydrogen atoms was more active in coarse-grained specimens most likely due to the high volume fraction of mechanical twins.…”

“…The hydrogen desorption rate was measured by TDA before and after the SSRTs during continuous heating at a constant rate of 100 K h À1 from room temperature to 650 K. The hydrogen desorption rate was normalized to the surface area of each sample. Each peak on the hydrogen desorption rate curve was converted to a hydrogen concentration [11,18,29,31].…”

Effect of hydrogen on nanomechanical properties in Fe-22Mn-0.6C TWIP steel revealed by in-situ electrochemical nanoindentation

“…However, controversial results showed that aluminum addition has a beneficial effect only in high-strain rate tensile tests, while it is detrimental and promotes crack formation during low-cycle fatigue tests [34]. Copper was reported to have a similar effect to aluminum, while titanium had a negative effect on the HE resistance [44,45]. Grain refinement was also proposed as a method for enhancing the resistance to HE in TWIP steels by suppressing the ductile-to-brittle transition through the reduction of twin-related boundaries and junctions [46].…”

A general perspective of Fe–Mn–Al–C steels

“…However, the reader is referred to the works of Motomichi Koyama et al [68,[310][311][312][313][314][315] who studied systematically several variables on the hydrogen embrittlement in these steels. Further interesting reading on this topic can be found in [238,[316][317][318][319][320][321][322][323][324][325]. Figure 61.…”