Annealing process is critical to mechanical properties and microstructure of DP steel. For steel with strength grade 590MPa, experiments different combinations intercritical annealing temperature over-aging were carried out during annealing. The tensile tests the final products nanohardness phases made, microstructures analyzed. results indicated that higher was favorable volume fraction marten...

A dual-phase steel chemistry has been processed with varying intercritical annealing temperatures and the properties investigated. It was found that increasing temperature in region led to an increase volume fraction (52%–65%) grain size (1.8–3.3 µm) of martensite whilst ferrite decreased. The highest tensile strengths were at low temperatures, achieving 935 MPa elongation values 21% achieved t...

Austenitization is an inevitable occurrence during the heat treatment of steels. Despite this consideration, less attention has been paid so far to the study of the formation of austenite as compared with the vast amount of research on its decomposition. That is because the steel properties depend basically on the transformation processes following austenitization. However, the initial austenit...

A novel concept of varying the strain hardening rate a medium Mn steel with 8 wt.% by duration intercritical anneal after hot rolling was explored. It found that stability austenite phase showed an inverse square root relationship annealing and maximum linear stability. The change in attributed to continuous enrichment increasing duration. Twinned martensite also be most likely product martensi...

Standard heat treatment of martensitic stainless steel consists quenching and tempering. However, this results in high strength hardness, while Charpy impact toughness shows lower values a large deviation its values. Therefore, modified 0.1C-13Cr-3Ni (PK993/1CH13N3) with intercritical annealing between Ac1 Ac3 was introduced before tempering to study effect on the microstructure mechanical prop...