Design of a novel HSLA steel with a combination of high strength (140–160 ksi) and excellent toughness

Author:

Nezhad Mehdi Soltan Ali1,Ghazvinian Sadegh2,Amirsalehi Mahmoud3,Momeni Amir4

Affiliation:

1. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology , Tehran , Iran

2. Department of Materials Science and Engineering, Iran University of Science and Technology , Tehran , Iran

3. Materials Science and Engineering Department, Sharif University of Technology , Tehran , Iran

4. Materials Science and Engineering Department, Hamedan University of Technology , Hamedan , Iran

Abstract

Abstract Three steels were designed based on HSLA-100 with additional levels of Mn, Ni, Cr and Cu. The steels were prepared by controlled rolling and tempered at temperatures in range of 550–700°C. The continuous cooling time curves were shifted to longer times and lower temperatures with the increased tendency for the formation of martensite at lower cooling rates. The microstructures revealed that controlled rolling results in austenite with uniform fine grain structure. The steel with the highest amount of Mn showed the greatest strength after tempering at 750 °C. The top strength was attributed to the formation of Cu-rich particles. The steel with 1.03 wt.% Mn, tempered at 650 °C exhibited the best Charpy impact toughness at –85°C. On the other hand, the steel that contained 2.11 wt.% Mn and tempered at 700 °C showed the highest yield strength of 1 097.5 MPa (∼159 ksi) and an impact toughness of 41.6 J at –85°C.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

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