PSI - Issue 19

Available online at www.sciencedirect.com

ScienceDirect

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 19 (2019) 504–512

Fatigue Design 2019 Characteristics of shear-mode fatigue crack growth behaviors in roll materials Keiji Yanase a,b , Akira Noda c , Nozomu Oda c , Masahiro Endo a,b, * a Department of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma Jonan-ku, Fukuoka City 814-0180, Japan b Institute of Materials Science & Technology, Fukuoka University, 8-19-1 Nanakuma Jonan-ku, Fukuoka City 814-0180, Japan c Hitachi Metals Wakamatsu, Ltd., 1-9-1 Kitahama, Wakamatsu-ku, Kitakyusyu City 808-0023, Japan

Abstract

The shear-mode fatigue crack behavior of work roll materials for hot strip mills was evaluated using cyclic torsion with superimposed static compression. Most of the deep cracks in rolls have grown under shear-mode during rolling, however there has been no practical methods to evaluate the fatigue behavior of roll materials in the presence of shear-mode crack, which has been a big obstacle for development of the work roll materials, especially the advanced materials like the high speed steel type roll materials. The present study shows that a high speed steel material has preferable torsional fatigue behavior than an enhanced ICDP (Indefinite Chill Double Poured cast iron) . However, in actual rolling, the enhanced ICDPs generally show better crack resistance than high speed steel roll type materials. Accordingly, further research is necessary utilizing the testing method.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers.

Keywords: Roll steels; shear-mode fatigue crack; torsional fatigue; S-N curve

1. Introduction

Rolling is one of the most important industrial processes because a higher volume of material is worked by rolling than any other techniques. Further, given the substantial industrial demand for rolled steel strip products, the increase in productivity with simultaneous cost reduction is an essential issue for the steel plants. Therefore, a great effort has been made to enhance the productivity and reliability of rolling mills by the improvement of the facilities and the rolling process. In practice, a roll is one of the crucial components, and its life is normally determined by the regular maintenance

* Corresponding author. Tel.: +81-92-871-6631; fax: +81-92-861-6031. E-mail address: endo@fukuoka-u.ac.jp

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.054