Thermal Cycle Cracking and Surface Modification of Gray Cast Iron Brake Drum
[1]LI Jian,LI Wenqiang,ZHANG Weiwei,et al.Thermal Cycle Cracking and Surface Modification of Gray Cast Iron Brake Drum[J].Journal of Zhengzhou University (Engineering Science),2023,44(03):116-122.[doi:10.13705/j.issn.1671-6833.2023.03.006]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
44
Number of periods:
2023 03
Page number:
116-122
Column:
Public date:
2023-04-30
- Title:
- Thermal Cycle Cracking and Surface Modification of Gray Cast Iron Brake Drum
- CLC:
- TH142
- DOI:
- 10.13705/j.issn.1671-6833.2023.03.006
- Abstract:
- In order to solve the problem of brake drum failure caused by frequent hot and cold cycles during continuous braking of heavy truck, a surface modification method, i.e., friction stir welding, was proposed to improve the thermal cracking resistance of the gray cast iron brake drum. In this experiment, the gray cast iron (HT250) brake drum was selected and the cyclic quenching treatment was used to simulate the service condition of the brake drum. The quenching treatment was set as 900 ℃ and the cooling method was water cooling. The Vickers hardness tester was used to measure the hardness changes of the samples before and after quenching treatment. Thereafter, the microstructure and crack morphology of the samples were characterized by the scanning electron microscope, energy dispersive spectrometer and metallographic microscope. It was found that frequent cold and hot cycling was the main reason for the failure of the brake drum. The experimental results showed that, after 20 cycles of quenching treatment, the cracks originated from the interface between graphite and pearlite, and then propagated mainly along the length of graphite. Besides that, the new phase of iron oxide is formed around the cracks. Moreover, the Vickers hardness of gray cast iron increased after cyclic quenching, but the hardness dispersion also increased. After the same numbers of cycle quenching, the number of cracks in the surface modified sample is less than that of the original sample, and the crack length was shorter. This is mainly because the graphite length width ratio on the surface of the gray cast iron decrease after the surface treatment, and the pearlite lamellar spacing decreased, which improve the resistance of crack initiation and propagation and thus enhanced the thermal cracking resistance of the gray cast iron brake drum.
- References:
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Last Update:
2023-05-09