The effects of cryogenic treatment on the toughness and tribological behaviors of eutectoid steel


ÇAKIR F. H. , ÇELİK O. N.

JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, vol.31, no.7, pp.3233-3239, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 31 Issue: 7
  • Publication Date: 2017
  • Doi Number: 10.1007/s12206-017-0613-3
  • Journal Name: JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3233-3239
  • Keywords: Eutectoid steel, Cryogenic treatment, Hardness, Microstructure, Retained austenite, Sub-zero treatment toughness, Wear resistance, MECHANICAL-PROPERTIES, WEAR-RESISTANCE, CARBURIZED STEEL, HEAT-TREATMENT, BEARING STEEL, D2 STEEL, MICROSTRUCTURE, STRESS, TOOL
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

Cryogenic treatment is a supplementary heat treatment usually applied after quenching. Its effects are permanent and this process affects the entire section. There have been many studies related to cryogenic treatment, most of which have been focused on tool steels. In the current study, a high-speed-train railway material was investigated, and different heat treatment processes were applied to the eutectoid steel. The effects of quenching and cryogenic treatment were investigated on the mechanical properties (toughness, hardness and wear). Four different structures were obtained with different heat treatment cycles: Pearlitic, tempered martensite, 12 hour cryo-treated tempered and 36 hour cryo-treated tempered. As a result of Charpy v-notch tests and hardness tests, cryogenic treatment was found to improve the toughness and hardness of quenched samples. The results of the ball-on-disc wear tests showed that the cryo-treated samples have better wear resistance than pearlitic and martensitic samples.