Effects of Nb and V on the Microstructure and Properties of Rolled Non-Quenched and Tempered Steels

Abstract:

The property and microstructure of rolled non-quenched and tempered steels of Nb-V comprehensive micro alloying have been investigated .The mechanical properties and the load –displacement curves were measured respectively by using electron tension test machine and digital-impact test machine . The microstructure and fracture surface of impact samples were observed with SEM .The results show that micro-alloying Nb and V non-quenched and tempered steel behaves higher tension strength and toughness than that of only V micro-alloying one under the condition of about same plasticity. Improvement of the properties is related with that Nb can effectively make fine pearlite group and inter-lamella spacing at the impact fracture pearlite flakes. Corresponding relationship between various domain of fracture morphology and characteristics points at the curve of digital impact has been discussed.

• Periodical: Advanced Materials Research (Volume 509)
• Pages: 75-81
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.509.75
• Online since: April 2012
• Authors: Ming Tu Ma, Hong Ya Yang, Hua Sheng Mei, Hong Zhou Lu
• Keywords: Digital Impact, Mechanical Property, Microalloyed Steel, Nb-V Comprehensive Alloying

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