Contact Fatigue Damage and Subsurface Microstruture of Cr5 Backup Roll

doi:10.12068/j.issn.1005-3026.2020.06.010

Abstract

Abstract: Optical microscope (OM)， scanning electron microscope (SEM)， transmission electron microscope (TEM)， micro-indentation tester and X-ray stress meter were employed to investigate the microstructure of backup rolls’ subsurface after rolling contact fatigue. The maximum value of fatigue damage was located on the subsurface of the backup roll which was about 400μm away from the surface. The increased hardness， reduced residual stress and elevated corrosion resistance of the subsurface resulted from rolling contact fatigue. Microstructure of the subsurface was broken into small pieces and dislocation density was increased. Under one constant contact stress， fatigue damage of backup roll increased with the increasing percentage of fatigue life.

Key words: backup roll, roll contact fatigue, microstructure, fatigue hardening, residual stress

CLC Number:

TB31

LI Yan-long， WU Qiong， QIN Xiao-feng， LIU Chang-sheng. Contact Fatigue Damage and Subsurface Microstruture of Cr5 Backup Roll[J]. Journal of Northeastern University Natural Science, 2020, 41(6): 818-823.

References

[1]Kopp R.Some current development trends in metal-forming technology［J］.Journal of Materials Processing Technology，1996，60:1-9.
[2]Ohkomori Y，Ikujiro K，Shinozuka K，et al.Cause and prevention of spalling of backup rolls for hot strip mill［J］.Transactions of the Iron and Steel Institute of Japan，1988，28(1):68-74.
[3]赵席春.Cr5型支承辊用钢的研究［J］.金属热处理，2003，28(6):26-28.(Zhao Xi-chun.Research on Cr5-type forged steel for backup roll［J］.Heat Treatment of Metals，2003，28(6):26-28.)
[4]Liddle A J，Shinozuka K，Nagamatsu T.Backup roll maintenance for preventing spalling accidents［J］.South East Asia Iron and Steel Institute Quarterly (Malaysia)，1998，27(1):8-64.
[5]Schrama R C.Types of failures of backup roll assemblies［J］.Iron and Steel Technology，2005(12):39-56.
[6]Ohkomori Y.Analysis of mode II crack growth behavior in spalling failure of backup roll［J］.Journal of the Society of Materials Science Japan，2001，50(3):249-254.
[7]Sun D L，Qin X F，Xie L Y，et al.Subsurface rolling contact fatigue damage distribution of backup roll after periodic dressing［J］.Journal of Failure Analysis and Prevention，2014，14(4):491-496.
[8]Qin X F，Sun D L，Xie L Y.Analysis of critical stress for subsurface rolling contact fatigue damage assessment under roll/slide contact［J］.Journal of Failure Analysis and Prevention，2014，14(1):61-67.
[9]Qin X F，Li F，Zhao X G.An approach for subsurface rolling contact fatigue damage assessment of backup roll material［J］.Journal of Failure Analysis and Prevention，2017，17(5):942-947.
[10]刘学伟，裴新华，周丽萍，等.Cr5支承辊失效分析［J］.物理测试，2007(4):55-57.(Liu Xue-wei，Pei Xin-hua，Zhou Li-ping，et al.Cracking failure analysis of back-up roll of Cr5［J］.Physics Examination and Testing，2007(4):55-57.)
[11]王玉辉，刘利刚，蔡大勇，等.支承辊钢接触疲劳过程中的表层组织变化［J］.中国表面工程，2012，25(6):85-89.(Wang Yu-hui，Liu Li-gang，Cai Da-yong，et al.Investigation of surface microstructure of back-up rolls steel under contact fatigue［J］.China Surface Engineering，2012，25(6):85-89.)
[12]Ye D，Wang Z.An approach to investigate pre-nucleation fatigue damage of cyclically loaded metals using Vickers microhardness tests［J］.International Journal of Fatigue，2001，23(1):85-91.
[13]Ungár T，Li L，Tichy G，et al.Work softening in nanocrystalline materials induced by dislocation annihilation［J］.Scripta Materialia，2011，64(9):876-879.
[14]Qin X F，Sun D L，Xie L Y，et al.Hardening mechanism of Cr5 backup roll material induced by rolling contact fatigue［J］.Materials Science and Engineering:A，2014，600(10):195-199.
[15]Kang J H，Hosseinkhani B，Rivera-Díaz-del-Castillo P.Rolling contact fatigue in bearings:multiscale overview［J］.Materials Science and Technology，2012，28(1):44-49.
[16]Zhang H W，Ohsaki S，Mitao S，et al.Microstructural investigation of white etching layer on pearlite steel rail［J］.Materials Science and Engineering:A，2006，421(1):191-199.
[17]Peeters B，Seefeldt M，Teodosiu C，et al.Work-hardening/softening behaviour of bcc polycrystals during changing strain paths.I:an integrated model based on substructure and texture evolution，and its prediction of the stress-strain behaviour of an IF steel during two-stage strain paths［J］.Acta Materialia，2001，49(9):1607-1619.
[18]Hiroshi T，Kazuo N，Keizo F，et al.Evaluation of subsurface fatigue damage in strip mill rolls by an X-ray diffraction method［J］.Transactions of the Iron and Steel Institute of Japan，1981，21:92-99.
[19]Pangborn R N，Weissmann S，Kramer I R.Measurement of cumulative fatigue damage by X-ray double-crystal and scanning diffraction methods［M］//Advances in X-Ray Analysis.New York: Springer，1981:203-208.
[20]Frolish M F，Beynon J H.Design criteria for rolling contact fatigue resistance in back-up rolls［J］.Ironmaking and Steelmaking，2004(4):300-304.
[15]关守平，房少纯.一种新型的区间-粒子群优化算法［J］.东北大学学报(自然科学版)，2012，33(10):1381-1384.(Guan Shou-ping，Fang Shao-chun.A new interval particle swarm optimization algorithm［J］.Journal of Northeastern University(Natural Science)，2012，33(10):1381-1384.)