Hot work roller surface layer degradation progress during thermal fatigue in the temperature range 500-700 °C

被引：16

作者：

Bombac, David ^{[1
,2
]}

Kugler, Goran ^{[2
]}

Markoli, Bostjan ^{[2
]}

Tercelj, Milan ^{[2
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England

[2] Univ Ljubljana, Fac Nat Sci & Engn, Askerceva 12, SI-1000 Ljubljana, Slovenia

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2017年 / 104卷

关键词：

Cast iron rollers; Thermal fatigue; Degradation; Cementite; Graphite; Cracks; Spalling; SPEED STEEL ROLLS; DIE-CASTING DIES; TOOL STEELS; FRACTURE PROPERTIES; ALLOYING ELEMENTS; LIFE PREDICTION; CRACK NETWORKS; PART I; BEHAVIOR; IRON;

D O I：

10.1016/j.ijfatigue.2017.08.008

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

A new test rig for thermal fatigue testing was used to investigate and characterise surface layer degradation of indefinite chill double pour (ICDP) cast iron hot work roller. Thermal fatigue tests were performed at three temperatures (500 degrees C, 600 degrees C and 700 degrees C) using a Gleeble 1500 D thermomechanical simulator. Appearance of cracking was evaluated quantitatively for each test temperature by following the average length of the seven longest cracks, the average length of all cracks and crack density after the preselected number of thermal cycles. We found that crack nucleation, crack propagation (growth), their linking and subsequent material spalling are related to the cementite and graphite particles characteristics. Revealed, were the appearance of internal cracks in cementite and graphite, propagation towards and from the test surface, cracks linking and material chipping. Based on observations, a better understanding of degradation mechanisms and their temperature related intensity was gained. Finally, suggestions for improved thermal fatigue resistance of cast iron rollers are given. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：355 / 365

页数：11

共 12 条

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