The influence of nitrogen (0 to 0.27 wtYo) on martensite formation in an experimental low-nickel stainless-steel alloy (Fe-17Cr-7Mn-4Ni) has been investigated. The alloys containing 0.1 wtYo or more nitrogen are fully austenitic at room temperature; those containing less nitrogen consist of a mixture of austenite, martensite and S-ferrite. The alloys containing less than 0.2 wtYo nitrogen are m...

Abstract A medium Mn steel (MMS) was cast by employing a vacuum induction furnace. After that, the hot rolled (HR) in order to achieve final thickness of 1.4 mm. The microstructure sheet found be composed martensite and little amount austenite, Ultimate Tensile Strength (UTS this processing condition close 1600 MPa negligible elongation found. An intercritical annealing (IA) heat treatment appl...

The strength of mixed microstructures of bainite and martensite can peak at an intermediate volume fraction of martensite has been published by recently experimental studies. A quantitative interpretation of these observations is achieved by modelling the mechanical properties of mixed microstructures of bainite and martensite. The peak in the curve of the strength as a function of the volume f...

Abstract The kinetics of reversed austenite formation in 301 stainless steel and its effect on the deformation an automobile front bumper beam are studied by using modeling approaches at different length scales. diffusion-controlled is Johnson–Mehl–Avrami–Kolmogorov (JMAK) model, based experimental data. model can be used to predict volume fraction a temperature range 650–750 °C. A three-dimens...

Modern TRIP assisted steels contain retained austenite with carbon concentrations in excess of 1 wt-%. Some of their mechanical properties, in particular the toughness and ductility, rely on the diffusionless transformation of this austenite into high-carbon martensite, induced by stress and strain. The properties can be excellent in spite of the fact that freshly formed high-carbon martensite ...

The purpose of this review was to investigate the correlation between magnetism and crystallographic structures as it relates to the martensite transformation of Ni2MnGa type alloys, which undergo martensite transformation below the Curie temperature. In particular, this paper focused on the physical properties in magnetic fields. Recent researches show that the martensite starting temperature ...

The current study applied thermomechanical processing (TMP) on 301 austenitic stainless steel to produce an ultrafine-grained structure, examining the dual effects of deformation at subzero temperature and TMP cycles strain-induced α′-martensitic transformation austenite reversion occurring upon subsequent annealing. Three schemes were adopted: (1) one cycle using a strain 0.30, (2) two 0.20, (...

Shape memory alloys exhibit a high damping capacity in the mktensite state. Results obtained from both DMA and cyclic tests under tension-compression load show that the martensite damping capacity in NiTi SMAs is a function of both strain amplitude and annealing temperature. Internal friction due to movements of martensite twin boundaries within both elastic (accommodation) and inelastic (reori...

The name martensite is after the German scientist Martens. It was used originally to describe the hard microconstituent found in quenched steels. Martensite remains of the greatest technological importance in steels where it can confer an outstanding combination of strength (> 3500MPa) and toughness (> 200MPam 1 2 ). Many materials other than steel are now known to exhibit the same type of soli...