Abstract
Cost-effective advanced design concepts are becoming more common in the production of thick plates in order to meet demanding market requirements. Accordingly, precipitation strengthening mechanisms are extensively employed in thin strip products, because they enhance the final properties by using a coiling optimization strategy. Nevertheless, and specifically for thick plate production, the formation of effective precipitation during continuous cooling after hot rolling is more challenging. With the aim of gaining further knowledge about this strengthening mechanism, plate hot rolling conditions were reproduced in low carbon Ti-Mo microalloyed steel through laboratory simulation tests to generate different hot-rolled microstructures. Subsequently, a rapid heating process was applied in order to simulate induction heat treatment conditions. The results indicated that the nature of the matrix microstructure (i.e., ferrite, bainite) affects the achieved precipitation hardening, while the balance between strength and toughness depends on the hot-rolled microstructure.
Highlights
In the recent years, suitable thermomechanical sequences combined with advanced microalloying concepts have been developed to fulfill the demanding market requirements in terms of tensile and toughness properties
Steels, yield strength values of approximately 400–500 MPa can be achieved through a combination of strengthening contributions from solid solution, grain size, dislocation density and fine precipitation properties [1,2]
Additional precipitation strengthening was achieved through the formation of fine nanosized precipitates during induction heat treatment
Summary
Suitable thermomechanical sequences combined with advanced microalloying concepts have been developed to fulfill the demanding market requirements in terms of tensile and toughness properties. Thisofallowed us to conclude treatment microstructures (ferritic, ferritic/bainitic, and bainitic), the reproduction of plate hot rolling a considerable strengthening contribution occurs after induction heat treatment for pre-treatment was carried out by plane compression tests. In order to minimize the strain gradients, the characterization of the microstructure was performed at the central parts of the plane compression specimensMetals [11].2018, In 8,addition the microstructural sample, specimens for tensile and Charpy x FOR PEERto. 3 of 22tests were machined for each condition. 25 TEMpart images andplane resulting in the formation of atwo number of Besides the characterization of the compression sample, cylindrical precipitates between and tensile specimens (4 mm in diameter and a gauge length of 17 mm) were machined under each. Defined in accordance with the modified hyperbolic tangent fitting algorithm reported by Wallin [12]
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