And Properties Of Ferritic Steel 16Mn Strain-induced Phase Transformation

In lOOOt pressing machine for low carbon steel16Mn between Ac3and Ar3temperature, using different ratio of reduction (50-80%) for industrialization of low carbon steel deformation induced ferrite phase change experiments.By OM, SEM, combined with mechanical testing, and SSRT slow strain rate tensile test, to study the low carbon steel during Ac3-Ar3temperature between different large reduction (50-80%) of deformation induced ferrite phase transformation after the experiment, analysis of organizational structure characteristics and mechanical properties and resistance to stress corrosion susceptibility, and analyzed the causes of low carbon steel16Mn deformation induced ferrite phase change mechanism and organizational structure performance results are as follows:1Steel in austenitic unrecrystallized the area after hot deformation, deformation induced ferrite phase transformation occurs;2After thermal deformation treatment of low-carbon steel in the ferrite content can reach above80%, the average grain size of5.8um, the deformation induced ferrite phase transformation the heating temperature is high, the cooling rate is faster, bigger shape variables, the finally obtained The amount of ferrite is higher, the smaller the grain size;3Deformation forming deformation energy storage, accumulation caused by the dislocation density of the energy increases, the phase change thermodynamic, kinetic analysis shows that:under the action of deformation energy storage, the ferrite phase becomes higher than the equilibrium temperature occur, the strain energy storage dislocation pileup behind the new phase formation surface free capacity to provide the driving force of the phase transition;4.After thermo mechanical treatment of low-carbon low-alloy steel with high hardness and tensile strength, deformation induced phase transformation under the effect of grain refinement, thus improving the mechanical properties of the steel;5. Slow strain rate tensile tests and fracture morphology results show that deformation induced ferrite phase transition within the steel there is a great deal of internal stress, resulting in poor resistance to hydrogen sulfide stress corrosion.