| Autor: |
A. Seshu Kumar, P. Ramesh Babu, K. Surender Rao, S. K. Abdul Khadeer |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Learning and Analytics in Intelligent Systems ISBN: 9783030243135 |
| DOI: |
10.1007/978-3-030-24314-2_79 |
| Popis: |
The present research work aims to investigate the microstructural and mechanical properties of AISI 4140 low alloy steel grade pipes in friction welded form both in as-received and reheating to 860 °C, oil quenching and followed by tempering at 520 °C (RQT) conditions. All the welds were subjected to post weld annealing at 600 °C. The weld zone primarily consists of fully plastically deformed zone (FPDZ), partially deformed zone (PDZ) and unaffected base metal (BM). Dynamically recrystallized microstructure was observed in both the sides of weld interface of FPDZ in the present investigation. The microstructure in FPDZ of RQT showed tempered martensite and small amounts of ferrite where as in as-received condition showed acicular ferrite and some amount of martensitic structure. In RQT condition, the micro hardness of the welds is higher than as-received condition. Generally FPDZ showed higher hardness than PDZ. RQT samples show a noticeable increase in the strength of joints as compared to that of as-received samples. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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