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Journal of Mining and Metallurgy B: Metallurgy
2015, vol. 51, br. 1, str. 81-87
jezik rada: engleski
vrsta rada: neklasifikovan
doi:10.2298/JMMB140120005J


Mechanical properties of low alloy high phosphorus weathering steel
(naslov ne postoji na srpskom)
aDr B R Ambedkar Institute of Technology, Port Blair, A&N Islands, India
bNational Institute of Foundry & Forge Technology, Hatia, India
cR & D Centre for Iron and Steel, SAIL, Doranda, India

e-adresa: gadadhar@sail-rdcis.com

Sažetak

(ne postoji na srpskom)
Mechanical behaviour of two low alloy steels (G11 and G12) was studied with respect to different phosphorus contents. Tensile strength and yield strength increased while percentage elongation at fracture decreased on increasing phosphorus content. The SEM and light optical photomicrograph of low phosphorus steel (G11) revealed ferrite and pearlite microstructures. On increasing phosphorus content from 0.25 wt.% to 0.42 wt.%, the morphology of grains changed from equiaxed to pancake shape and grain size also increased. The Charpy V notch (CVN) impact energy of G11 and G12 steel at room temperature was 32 J and 4 J respectively and their fractographs revealed brittle rupture with cleavage facets for both the steels. However, the fractograph of G11 steel after tensile test exhibited ductile mode of fracture with conical equiaxed dimples while that of G12 steel containing 0.42 wt. % P exhibited transgranular cleavage fracture. Based on this study, G11 steel containing 0.25 wt. % P could be explored as a candidate material for weathering application purpose where the 20 oC toughness requirement is 27 J as per CSN EN10025-2:2004 specification.

Ključne reči

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*** ASTM E 8M-98: Standard test methods for flat bar tensile testing of metallic materials
*** ASTM E 23-05: Standard test methods for impact testing of metallic materials
*** (2004) European standard No. CSN EN 10025-2: 2004: Hot rolled products of structural steels: Technical delivery conditions for non-alloy structural steels. Part 2
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