Effects of Heat Treatment and Severe Plastic Deformation on Microstructure, Mechanical Properties and Midsection Ultimate Strength of Shipbuilding Steel

Improving the strength values of low–medium-strength shipbuilding steels without changing chemical properties will be very useful to meet high-strength requirement in ships. Heat treatments and severe plastic deformation methods are main used increase steel structure. Considering high improvement effect values, quenching process equal channel angular pressing (ECAP) method stand out among heat methods, respectively. In current study, ECAP were applied changes microstructure mechanical after these comparatively investigated. While martensite was formed quenching, average grain size decreased compared base material a phase change with ECAP. Hardness increased by 100% 80% Yield tensile 3.3 2.5 times, respectively, quenching. On other hand, yield raised less than 1.5 1.7 material. Impact toughness 10% Also, corrosion resistance 13% Changes processes reflected middle section ship using finite element-based programs approximately times higher that for all dimension load–ultimate under uniaxial compression reached model reflecting quenched samples.