Susceptibility of three lean-alloyed ferritic-austenitic stainless steels to hydrogen-induced delayed cracking was examined, concentrating on internal hydrogen contained in the materials after production operations. The aim was to study the role of strain-induced austenite to martensite transformation in the delayed cracking susceptibility. According to the conducted deep drawing tests and cons...

Terms of service of the steels with retained austenite in the microstructure, is severely depended on the stability of austenite during the course of deformation. The present work aims to evaluate the mechanical stability of austenite in nanostructured, carbide free bainitic steels during tensile testing and cold rolling process. To achieve the microstructure with retained austenite, the steel ...

The transformation-induced plasticity (TRIP)-effect is an efficient way to increase the formability in high performance steels. Hence, optimal stability of retained austenite crucial benefit most from this effect. In present work, in-situ energy X-ray diffraction was used study martensite transformation upon uniaxial tensile loading a TRIP-assisted steel produced by quenching and partitioning (...

Martensitic thin films have applications in actuators, sensors, and micromachines because of their large work output/(cycle · volume) [22]. Single-crystal martensitic thin films have recently been grown in the laboratory [12] and theoretically offer even larger work output/(cycle · volume) [5]. Bhattacharya and James [5] have rigorously derived a thin film variational principle from the three-d...

the pseudo-elastic behavior of shape memory alloy (sma) truss and cantilever beam are investigated. brinson’s one-dimensional material model, which uses the twinned and detwinned martensite fractions separately as internal variables, is applied in the algorithm to establish the sma stress-strain characteristics. this material model also incorporates different young’s modulus for austenitic and ...

The mechanical behavior of a metastable high entropy alloy (HEA) with composition Fe39-Mn20-Co20-Cr15-Si5-1Al at% is investigated. deformation mechanisms contributing to its properties are unveiled, by performing uniaxial tensile tests in situ synchrotron X-ray diffraction. Three distinct regimes detected. initial elastic and early dislocation-based plasticity followed moderate work hardening r...

Austenitic high manganese steels exhibit outstanding mechanical properties, such as energy absorption, owing to various deformation-mechanisms dislocation slip, twinning-induced plasticity (TWIP) and transformation-induced (TRIP). Here, we show a novel thermomechanical treatment manufacture steel Fe–18Mn-0.3C (wt.-%) with excellent performance by combining these three deformation-mechanisms. Th...

Shape Memory Alloys (SMAs) undergo stress and temperature induced reversible diffusionless crystalline phase transformations between a high synmaetry phase (austenite) stable at high tenlperatures and low stresses, and a low symmetry phase (martensite) stable at low temperatures and high stresses. Unusual macroscopic effects arise from these crystallographic changes, chiefly shape memory and su...