Twinning and strain-induced f.c.c. → h.c.p. transformation on the mechanical properties of CoNiCrMo alloys

Deformation Twinning Behavior of Twinning-induced Plasticity Steels with Different Carbon Concentrations – Part 2: Proposal of Dynamic-strain-aging-assisted Deformation Twinning

“…Motomichi KOYAMA, 1,2) * Takahiro SAWAGUCHI 1) and Kaneaki TSUZAKI 1,2) In addition to the aforementioned tendency, an addition of carbon has been reported to affect the twinning behavior as follows:…”

“…In general, deformation twinning is suppressed with increasing stacking fault energy because the nuclear region of deformation twins consists of stacking faults. [1][2][3] The stacking fault energy has been known to increase with increasing temperature 4) and specific solute atom concentration, 1) suppressing deformation twinning. [1][2][3] In particular, carbon is an important solute element affecting twinning behavior in high Mn austenitic steels which is a typical low stacking fault energy material.…”

Strain-Induced Martensitic Trandormation in Fatigued Cast Co-Cr-Mo Alloy Used for Surgical Implants

“…Remy et al (7)(8) reported that for stacking fault energy values approximately less than IS ergs/cm 2 the fcc to hcp martensitic transformation could be induced by plastic deformation at room temperature. A higher stacking fault energy value leads to the formation of twins.…”

“…As for fcc to hep martensitic transformations, the nucleation of hcp platelets has been suggested to occur due to overlapping of stacking faults, such nuclea tlon is accelerated by the low stacking fault energy (6)(7)(8). Therefore, it has been pointed out that stacking faults In an fcc austenite play an important role in this phase transformation.…”

Control of cryogenic intergranular fracture in high-manganese austenitic steels

“…deformation twinning may also occur in low SFE materials. especially at low temperatures and high strain rates [35][36][37]. The tip of a de forma t ion tw in can be envis ioned as the he ad of a dislocation pile-up.…”