In the pursuit of simultaneously improving yield strength and plasticity austenitic stainless steel, a new steel was fabricated by induction smelting using pure N2 atmosphere, hot forging, cryogenic rolling, annealing. The material characterized microstructures with 3–4 μm uniform finer grains, fine precipitates, high thermal stability austenite, extensive high-angle grain boundaries. elongation after fracture, strength, ultimate tensile samples reached 53.5 %, 707 MPa, 1020 respectively, as...

A low-cost and easy-to-produce C–Mn–Cr automotive steel for both cold hot forming is presented in this paper. The alloying element Cr was used to replace Mn medium-Mn instead of B hot-formed steel, order achieve microstructure control hardenability improvement, replacing the residual austenite-enhanced plasticization with multidimensional enhanced through multiphase design, grain refinement, dispersion enhancement second-phase particles. products strength elongation cold-formed were 20 GPa·%...

The effect of Ce element on the evolution recrystallization texture in a 1.2%Si-0.4% Al non-oriented electrical steel during annealing process was investigated by using OM, SEM/EBSD and OIM software. results showed that recrystallized grain size ratio specimens containing are coarser higher than those without respectively. fraction favourable textures with is also Ce. Moreover, unfavorable {111} very less. Appropriate purified steel, reduced fine MnS, coarsen modified Al2O3 spherified AlN...

To investigate the plastic deformation behavior of 18CrNi4A steel at high temperatures, an isothermal hot compression test was conducted on a Thermecmastor-Z series machine temperatures from 1273 K to 1423 and strain rates ranging 0.01 s−1 10 s−1. The effects these two factors flow stress were analyzed. Based true stress–strain experimental curves, original Johnson–Cook constitutive model applied determine data under different conditions. prediction results compared with data. main reason...

The hot deformation behavior of 22Cr‐25Ni austenitic heat‐resistant steel at the temperatures 950–1150 °C and strain rates 0.01–10 s −1 is studied by isothermal compression test. It found that dynamic recrystallization (DRX) degree increases with increase temperature. DRX decreases rate from 0.01 to 1 , whereas 10 . activation energy as high 624.25 kJ mol due addition a large number alloying elements. typical compensation Arrhenius constitutive model established can be used roughly predict...

The pitting corrosion of thermally aged Z3CN20.09M cast duplex stainless steel (CDSS) was investigated using potentiodynamic polarisation and electrochemical impedance spectroscopy. Both potential charge transfer resistance values specimens became less positive with aging time, while passive current density increased, indicating that thermal causes degradation in resistance. after annealed is higher than revealing the has been improved. α' phase precipitation during ferrite brings...

The effect of ferrite phase on the precipitation σ in a Z3CN20.09M cast austenitic stainless steel (CASS) used for primary coolant pipes pressurized water reactor (PWR) nuclear power plants was investigated by using isothermal heat-treatment, optical microscopy (OM), transmission electron (TEM) and probe microanalysis (EPMA) techniques. influence different morphologies volume fractions formation mechanism discussed. amount precipitated all specimens with microstructures increased increasing...

The pitting corrosion of three duplex steels (DSS), SAF2205, SAF2507, Z3CN20.09M thermally aged at 350 - 500 ℃ for 5500 h was investigated by the means electrochemical techniques. potential (Ep) specimens decreased with increasing ageing temperature, however, Ep SAF2205 and SAF2507 first reached lowest value 450 then increased slightly. impedance spectroscopy results are coincident potentiodynamic polarisation testing results. variation in charge transfer resistance coincided values. There...

The effect of austenitizing temperature and aging treatment on the microstructure mechanical properties two new cold-rolled automotive steel plates (20Mn2Cr 20Mn2CrNb) was investigated by using isothermal heat treatment, optical microscope, scanning electron microhardness tester, tensile testing machine. results show that as increased, original austenite grain sizes both steels increased. size 20Mn2CrNb smaller than 20Mn2Cr. gradually decreased with increasing temperature, while hardness...

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The poly (L‐lactide) (PLLA) samples from melt were isothermally crystallized at 175°C and 190°C under pressures ( P C ) ranging 0.1 to 400 MPa. crystalline structures thermal properties investigated by using wide‐angle X‐ray diffraction (WAXD) differential scanning calorimetry (DSC). On the basis of DSC WAXD results, it is confirmed that an α crystal was formed in low‐pressure region ≤ 50 MPa), disordered ′) medium‐pressure (100 MPa 200 MPa) for PLLA 175°C. However, only pressure range MPa,...

The effect of sigma phases on the moderate-temperature tensile properties Z3CN20.09M casting austenite stainless steel was investigated by means isothermal treatment, scanning electron microscopy, transmission instrumented nanoindentation, testing, and finite element simulation. results show that yield strength ultimate aged specimens tested at moderate temperature increase remarkably with an increasing phase, while elongation break decreased. strain-hardening rate is higher than unaged...