Tribological properties of carbon steel brake discs affected by microstructure and disc temperature
- 주제(키워드) 주강 디스크 , 미세조직 , 마찰특성 , 페이드 , 열전도도
- 발행기관 고려대학교 대학원
- 지도교수 장호
- 발행년도 2014
- 학위수여년월 2014. 8
- 학위구분 석사
- 학과 일반대학원 신소재공학과
- 원문페이지 53 p
- 실제URI http://www.dcollection.net/handler/korea/000000052268
- 본문언어 영어
- 제출원본 000045808745
초록/요약
The tribological properties of carbon steel discs was studied using a 1/5 scale dynamometer. Carbon steel discs were tempered on various temperatures (400, 500, 600 and 700 ℃) to make different microstructure respectively. After tempering, microstructure morphology, hardness and thermal diffusivity were investigated. In the low temperature friction tests (IBT 70 ℃), friction coefficient increased and surface temperature also increased during brake procedure. On the other hand, in the high temperature friction tests (IBT 470 ℃), friction coefficient decreased as disc temperature increased on discs which had a low thermal diffusivity. In case of friction levels, microstructure change of disc during friction test caused unstable contact surface which is an important factor for friction levels.
more목차
List of Table and Figure Captions ⅲ
1. Introduction 1
1.1. Characteristics of carbon steel discs used as brake system 1
1.2. Research objectives 3
2. Experiments 5
2.1. Specimen preparation 5
2.2. Physical properties of carbon steel discs 10
2.3 Friction test 14
3. Results and discussion 17
3.1. Friction performance at low temperature 17
3.2. Friction performance at high temperature 22
3.2.1. Fade phenomenon by thermal diffusivity 29
3.2.2. Friction coefficient drop by microstructure change 34
4. Conclusions 39
References 41
