Effect of Spheroidization Annealing on Pearlite Banding

Abstract

The present paper deals with the influence of the duration of isothermal spheroidization annealing on the evolution of pearlite bands in various initial states. In this study, two initial conditions of the steel 16MnCrS5 are considered: a) industrially hot-rolled pearlite structures in their ferritic matrix and b) a specifically adjusted microstructure in the lab condition. Based on the experimental investigations and quantitative microstructural analyses, an empirical model for the prediction of pearlite banding within a broad range of annealing durations could be derived. Both, experiment and model, agree that pronounced pearlite bands in the initial state almost disappear after 25 h of spheroidization annealing. On the other hand, a marginal degree of pearlite banding in the initial state increases slightly during annealing. This fact could be explained by inhomogeneous cementite formation inside and outside the primary segregation regions of manganese.

Experimental Investigations and Multiscale Modeling to Study the Effect of Sulfur Content on Formability of 16MnCr5 Alloy Steel

“…Transverse extrusions tests were performed on cylindrical samples of average 25 mm height and 10.5 mm diameter. The tests were carried out on 400 kN hydraulic press according to already published method by Guk and Kawalla . The schematic diagram of the setup is shown in Figure .…”

Investigating the Effect of Cementite Particle Size and Distribution on Local Stress and Strain Evolution in Spheroidized Medium Carbon Steels using Crystal Plasticity‐Based Numerical Simulations

“…The simulation tool must be capable of predicting close to actual mechanical response of the material depending upon its constituent's volumetric fraction, crystallographic texture, microstructure, [ 25 ] and process history used to synthesize it. [ 26,27 ] Various models that have been proposed from time to time for a better understanding of the crystalline materials are briefed in Table 1 .…”

“…This is important, because prolonged spheroidization may result in reduced strength of the material, [ 22,23 ] and is a time and energy‐consuming process. [ 2,24,25 ]…”

Exploring the Structure–Property Relationship in Spheroidized C45EC Steel Using Full Phase Crystal Plasticity Numerical Simulations

“…The ductility of carbon steels is influenced by postproduction thermal processing; [16] therefore, the spheroidization process improves the formability by breaking down the 3D pearlite-cementite laths into elliptical or spherical particles. [17,18] The degree of lathy cementite conversion to spheroidal particles by a specially designed thermomechanical treatment process is called "spheroidization degree." This results in improved mechanical properties of carbon steels, i.e., the hardness (HV 10 ) with 50% spheroidization degree of medium carbon steel can lower from 326 to 229, resulting in better formability of the material.…”