Abstract
The contact between train wheels and rail tracks is known to induce material degradation in the form of wear, and rolling contact fatigue in the railhead. Laser cladding, a state of the art surface engineering technique, is a promising solution to repair damaged railheads so as to alleviate the rates of degradation and extend the component longevity. In this paper, effects of cladding material and heat treatment on microstructures of laser treated rails is presented. Laser cladding of premium hypereutectoid rail, four different depositing materials, and different heat treatments were investigated. For the preheating length of 400 mm, equal to the cladding length, the formation of martensite in heat affected zone (HAZ) was not hindered by the application of preheating to 350 °C on the rail-longitudinally deposited railhead of the four materials. Consequentially, cracking in the clad and HAZ was expected. An uncracked microstructure with excellent microstructural consistency across the entire rail-longitudinally deposited railhead and its HAZ was established using a heat treatment combination consisting of pre-heating, post-heating, and slow cooling, regardless of the depositing materials.
| Original language | English |
|---|---|
| Title of host publication | ICRT 2017 |
| Subtitle of host publication | Railway Development, Operations, and Maintenance - Proceedings of the First International Conference on Rail Transportation 2017 |
| Editors | Wanming Zhai, Kelvin C. P. Wang |
| Place of Publication | Reston VA USA |
| Publisher | American Society of Civil Engineers |
| Pages | 452-463 |
| Number of pages | 12 |
| ISBN (Electronic) | 9780784481257 |
| Publication status | Published - 1 Jan 2018 |
| Event | International Conference on Rail Transportation 2017: Railway Development, Operations, and Maintenance - Southwest Jiaotong University, Chengdu, China Duration: 10 Jul 2017 → 12 Jul 2017 Conference number: 1st http://www.icrt-swjtu.org/ |
Conference
| Conference | International Conference on Rail Transportation 2017 |
|---|---|
| Abbreviated title | ICRT 2017 |
| Country | China |
| City | Chengdu |
| Period | 10/07/17 → 12/07/17 |
| Internet address |
Keywords
- HAZ
- Heat treatment
- Hypereutectoid rail grade
- Laser cladding
- Microstructure
Cite this
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Laser cladding for railway repair : Influence of depositing materials and heat treatment on microstructural characteristics. / Lai, Quan; Abrahams, Ralph; Mutton, Peter; Qiu, Cong; Paradowska, Anna; Soodi, Mehdi; Roy, Taposh; Yan, Wenyi.
ICRT 2017: Railway Development, Operations, and Maintenance - Proceedings of the First International Conference on Rail Transportation 2017. ed. / Wanming Zhai; Kelvin C. P. Wang. Reston VA USA : American Society of Civil Engineers, 2018. p. 452-463.Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review
TY - GEN
T1 - Laser cladding for railway repair
T2 - Influence of depositing materials and heat treatment on microstructural characteristics
AU - Lai, Quan
AU - Abrahams, Ralph
AU - Mutton, Peter
AU - Qiu, Cong
AU - Paradowska, Anna
AU - Soodi, Mehdi
AU - Roy, Taposh
AU - Yan, Wenyi
PY - 2018/1/1
Y1 - 2018/1/1
N2 - The contact between train wheels and rail tracks is known to induce material degradation in the form of wear, and rolling contact fatigue in the railhead. Laser cladding, a state of the art surface engineering technique, is a promising solution to repair damaged railheads so as to alleviate the rates of degradation and extend the component longevity. In this paper, effects of cladding material and heat treatment on microstructures of laser treated rails is presented. Laser cladding of premium hypereutectoid rail, four different depositing materials, and different heat treatments were investigated. For the preheating length of 400 mm, equal to the cladding length, the formation of martensite in heat affected zone (HAZ) was not hindered by the application of preheating to 350 °C on the rail-longitudinally deposited railhead of the four materials. Consequentially, cracking in the clad and HAZ was expected. An uncracked microstructure with excellent microstructural consistency across the entire rail-longitudinally deposited railhead and its HAZ was established using a heat treatment combination consisting of pre-heating, post-heating, and slow cooling, regardless of the depositing materials.
AB - The contact between train wheels and rail tracks is known to induce material degradation in the form of wear, and rolling contact fatigue in the railhead. Laser cladding, a state of the art surface engineering technique, is a promising solution to repair damaged railheads so as to alleviate the rates of degradation and extend the component longevity. In this paper, effects of cladding material and heat treatment on microstructures of laser treated rails is presented. Laser cladding of premium hypereutectoid rail, four different depositing materials, and different heat treatments were investigated. For the preheating length of 400 mm, equal to the cladding length, the formation of martensite in heat affected zone (HAZ) was not hindered by the application of preheating to 350 °C on the rail-longitudinally deposited railhead of the four materials. Consequentially, cracking in the clad and HAZ was expected. An uncracked microstructure with excellent microstructural consistency across the entire rail-longitudinally deposited railhead and its HAZ was established using a heat treatment combination consisting of pre-heating, post-heating, and slow cooling, regardless of the depositing materials.
KW - HAZ
KW - Heat treatment
KW - Hypereutectoid rail grade
KW - Laser cladding
KW - Microstructure
UR - http://www.scopus.com/inward/record.url?scp=85048706916&partnerID=8YFLogxK
M3 - Conference Paper
SP - 452
EP - 463
BT - ICRT 2017
A2 - Zhai, Wanming
A2 - Wang, Kelvin C. P.
PB - American Society of Civil Engineers
CY - Reston VA USA
ER -