Fatigue Failure Analysis for Bimetallic Work Roll in Hot Strip Mills

Abstract

In hot rolling of steels, bimetallic rolls consisting of high‐speed steel and ductile casting iron are extensively used because of their excellent hardness and wear resistance although the fatigue failure study is not available. To extend the roll life service, herein, a 3D finite element method is applied to investigate the residual stress and the rolling stress of the bimetallic work roll in the four‐high rolling mill. The residual stress is analyzed by considering preheating, quenching, and tempering. Using the results as an initial condition, the rolling stress analysis is carried out consecutively. Then, the fatigue failure risk is discussed focusing on several critical points subjected to the largest stress amplitude inside of the work roll. The accuracy of the simple superposition method is also discussed to evaluate the risk conveniently.

Investigation of the heat energy and multi‐level load on subsurface fatigue damage evolution via multi‐scale method

“…Rolling contact fatigue widely exists in rail transit, aerospace, steel rolling and other fields 1–3 . With the development of modern industry, more and more important components are used in harsh environments such as high temperature, high pressure and high speed 4,5 . Under the action of different cycle load stress, fatigue crack initiation occurs in the parts, and the material properties of the parts change, which greatly reduces the service life of the parts and the reliability of the system operation at elevated temperature.…”

“…[1][2][3] With the development of modern industry, more and more important components are used in harsh environments such as high temperature, high pressure and high speed. 4,5 Under the action of different cycle load stress, fatigue crack initiation occurs in the parts, and the material properties of the parts change, which greatly reduces the service life of the parts and the reliability of the system operation at elevated temperature. It is of great engineering significance to study the influence of thermal energy on fatigue damage under high temperature environment and establish the prediction model of rolling fatigue damage life considering thermal energy effect.…”

Improvement of Contact Stress Distribution Between Work Roll and Backup Roll of a Hot Strip Mill

“…Contact state is affected by many factors, among them roll profile is an important one. Rolling contact fatigue in the form of spalling may produce by uneven distribution and huge peaks of contact stress [1,2]. Strip shape is a key aspect of the steel quality, which is also affected by contact state [3,4].…”