Usefulness of Non‐Uniform Heating and Quenching Method for Residual Stress of Bimetallic Roll: FEM Simulation Considering Creep Behavior. Issue 3 (17th August 2016)

• Record Type: Journal Article
• Authors: Noda, Nao‐Aki; Hu, Kejun; Sano, Yoshikazu; Ono, Katsma; Hosokawa, Yusuke
• Is Part Of: Steel research international. Volume 88:Issue 3(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-08-17
• Subjects: residual stress -- work roll -- quenching -- FEM -- creep; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201600165
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : Bimetallic rolls are widely used in steel rolling industries because of the excellent hardness, wear resistance, and high temperature properties. Controlling the residual stress distribution is important to improve the roll fatigue life due to the compressive residual stress at the roll surface. Recently, to reduce the tensile residual stress appearing at the roll center, quenching heat treatment is performed just after heating the roll non‐uniformly instead of heating the roll uniformly with enough time. In this paper, therefore, the residual stresses are compared after between the uniform heating quenching and the non‐uniform heating quenching on the basis of the FEM simulation. The results show that tensile stresses at the roll center for non‐uniform heating are smaller than that for uniform heating by 400 MPa, although the same compressive stresses appear at the surface. The effect of creep on stress relaxation is also considered in this study. By considering creep, the maximum tensile residual stress decreases by 8% for uniform heating and by 15% for non‐uniform heating. Abstract : The residual stress is investigated for bimetallic roll after non‐uniform heating and quenching in comparison with the one after uniform heating and quenching. The usefulness of non‐uniform heating quenching is discussed for reducing the risk of thermal barrel breakage. In this FEM simulation, the effect of creep on stress relaxation is also considered.