S M Abbasi
,
A Shokuhfar
钢铁研究学报(英文版)
The effect of vanadium (V) addition on the mechanical properties of a CrNiMoCuTi stainless steel was studied and its influence on microstructural changes was also investigated. Results indicate that the structure of the solutiontreated specimens mainly comprises of austenitemartensite, and adding V leads to the formation of a considerable amount of ferrite. Under this condition, austenite phase is not mechanically stable, and transforms to martensite by plastic deformation. The addition of 05% - 10% (in mass percent) of V increases the hardness and the strength of the 80% cold rolled and aged steel, without any effect on ductility. Improvement in mechanical properties is presumably attributed to the formation of a small amount of ferrite in the primary structure, and the formation of certain precipitates is accelerated by the addition of V during aging. By contrast, excessive V decreases the strength and ductility simultaneously. This is due to the strong effect of ferrite formation compared to the beneficial effect of precipitation. The loss of ductility caused by adding higher amount of V is due to the formation of ferrite phases which in turn are suitable nucleation sites for crack propagation.
关键词:
stainless steel;vanadium;microstructure;mechanical property
M Safavi
,
S M Abbasi
,
R Mahdavi
钢铁研究学报(英文版)
The influence of 001% to 025% of Aluminum content (in mass percent) on the mechanical properties and cold workability of low thermal expansion Fe-33Ni-15Co sheets in the annealed and hot rolled condition was investigated. Addition of Al up to 015% resulted in the increase of ductility and toughness and improvement of workability. Besides, achievement of fine grain structure and increase in the amount of annealing twins caused ductility to improve. Addition of Al higher than 015% led to the increase in oxidation reaction during melting process and to refine under argon atmosphere. This caused the volume fraction of Al containing inclusions to increase and consequently the ductility and toughness to decrease.
关键词:
Fe-33Ni-15Co alloy
,
Al content
,
mechanical property
,
cold workability
