Abstract
A microalloyed steel, C70S6, with a solidification interval of 1390-1479 °C, was thixoforged in the semisolid state in a closed die at temperatures in the range 1400-1475 °C to form a 1/7 scaled-down model of a passenger vehicle connecting rod. Die design and an optimized thixoforging temperature eliminated the excessive flash and other problems during forging. Tension test samples from connecting rods thixoforged at the optimum temperature of 1440 °C exhibited nearly the same hardness, yield strength, and ultimate tensile strength as conventional hot forged samples but ductility decreased by about 45% due to grain boundary ferrite network formed during cooling from the thixoforging temperature. Thus, C70S6-grade steel can be thixoforged at 1440 °C to form flash-free connecting rods. This conclusion was also validated using FEA analysis.
| Original language | English |
|---|---|
| Pages (from-to) | 5020-5029 |
| Number of pages | 10 |
| Journal | Journal of Materials Engineering and Performance |
| Volume | 25 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 1 Nov 2016 |
Bibliographical note
Publisher Copyright:© 2016, ASM International.
Funding
Authors greatly acknowledge The Scientific and Technological Research Council of Turkey (TUBITAK) for the financial support given during this research through TEYDEB 3130030 project. Authors acknowledge Mr. Taner MAKAS, R&D Manager of KANCA Forging Company, for his valuable comments. Authors also acknowledge Dr. Nuri SOLAK for his help in computation of the phase diagram, Prof. Dr. Hüseyin CİMENOGLU and Prof. Dr. Sakin ZEYTİN for their helpful discussions.
| Funders | Funder number |
|---|---|
| TUBITAK | TEYDEB 3130030 |
| Türkiye Bilimsel ve Teknolojik Araştirma Kurumu |
Keywords
- C70S6
- connecting rods
- forging
- optical metallography
- steel
- thixoforging