Correlation between Microstructure/Fracture Surfaces and Material Properties

• Authors: R. Bidulský , J. Bidulská , M. Actis Grande
• Languages of publication: EN

Abstracts

EN

The present paper deals with the evaluation of the effect of different vacuum heat treatments on the microstructure and fracture surfaces of a low alloyed sintered Fe-[1.5Cr-0.2Mo]-0.6C steel, in correlation with the mechanical and plastic properties achieved. The heat treatment consists of the sintering process in vacuum furnace at 1393 K for 1800 s, followed by different cooling conditions and an integrated final tempering at 473 K for 3600 s. The average cooling rates, calculated in the range of 1393 K to 673 K, were 0.1, 0.235, 3, and 6 K/s, respectively. Vacuum heat treatment is supporting the bainitic-martensitic microstructure, the higher the faster cooling rate applied. This provides a marked increase in strength coupled to a decrease in ductility. The decrease of the impact energy after heat treatment is justified by the microstructural changes, especially if a part of bainite is converted to brittle martensite. Samples with bainitic microstructure presented higher impact energies than those with martensitic microstructure. This is fully confirmed by the fracture surface analysis at higher magnification, revealing three main micromechanisms of fracture: brittle, ductile and quasi-cleavage.

Keywords

EN

81.05.Bx; 81.20.Ev; 81.40.-z; 62.20.mm; 62.25.Mn

Discipline

• 62.20.mm: Fracture
• 81.40.-z: Treatment of materials and its effects on microstructure, nanostructure, and properties
• 81.20.Ev: Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
• 62.25.Mn: Fracture/brittleness
• 81.05.Bx: Metals, semimetals, and alloys

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 3
• Pages: 548-552

Dates

published

2012-09

Contributors

author

R. Bidulský

• Department of Applied Science and Technology, Politecnico di Torino, T. Michel 5, 15 100, Alessandria, Italy

author

J. Bidulská

• Department of Metals Forming, Faculty of Metallurgy, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia

author

M. Actis Grande

• Department of Applied Science and Technology, Politecnico di Torino, T. Michel 5, 15 100, Alessandria, Italy

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Identifiers

DOI

10.12693/APhysPolA.122.548