Back to Search
Start Over
Effects of quench-tempering and laser hardening treatment on wear resistance of gray cast iron
- Source :
- Journal of Materials Research and Technology, Vol 9, Iss 4, Pp 8163-8171 (2020)
- Publication Year :
- 2020
- Publisher :
- Elsevier, 2020.
-
Abstract
- The present research studied the combined effects of quench-tempering and laser surface hardening treatments on wear behavior of gray cast iron, and compared results with conventional austempered gray cast iron. Four tempering temperatures of 316 °C (600 °F), 399 °C (750 °F), 482 °C (900 °F) or 552 °C (1025 °F) with a constant holding time of 60 min and four austempering temperatures of 232 °C (450 °F), 288 °C (550 °F), 343 °C (650 °F) or 399 °C (750 °F) with a constant holding time of 120 min were utilized in the heat treatment design. The wear tests were carried out on a universal mechanical tribometer with a reciprocating ball-on-plate sliding configuration. Also, the microstructure, micro-hardness profiles and worn tracks were examined. Through this work, it was found that three zones existed under the laser hardened surface. Zone 1 was the laser hardened zone containing ledeburite with hardness of approximately 68HRC. Zone 2 was the heat affected zone containing the martensite with hardness of approximately 66HRC. Zone 3 was the substrate with hardness ranging from 42.1 to 24.8HRC. In the sliding wear tests, the quench-tempering treatment only resulted in higher wear resistance of gray cast iron when compared with untreated specimens, but lower wear resistance than that of austempered gray cast iron under similar macro-hardness. The wear performance of the quench-tempered gray cast iron was enhanced after receiving the laser surface hardening treatment. Finally, the laser hardened and quench-tempered gray cast iron with tempering temperature of 552 °C showed similar mass loss due to wear as austempered gray cast iron with an austempering temperature of 232 °C. By observing the worn surfaces, the laser hardened regions could effectively inhibit the formation and propagation of cracks developed within the substrate regions. In addition, the substrate with low hardness in laser hardened and quench-tempered gray cast iron may provide enhanced ductility and toughness for gray cast iron engineering components. The results obtained in this research have significant value in selecting the optimum heat treatment process for laser hardened gray cast iron components.
- Subjects :
- lcsh:TN1-997
Heat-affected zone
Materials science
02 engineering and technology
engineering.material
01 natural sciences
Biomaterials
Gray cast iron
Quench-tempering
0103 physical sciences
Tempering
lcsh:Mining engineering. Metallurgy
010302 applied physics
Ledeburite
Metallurgy
Metals and Alloys
021001 nanoscience & nanotechnology
Microstructure
Laser surface hardening
Surfaces, Coatings and Films
Martensite
Ceramics and Composites
Hardening (metallurgy)
engineering
Cast iron
0210 nano-technology
Austempering
Subjects
Details
- Language :
- English
- ISSN :
- 22387854
- Volume :
- 9
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Research and Technology
- Accession number :
- edsair.doi.dedup.....354d7d160601d2d0171cf735e8386adc