THE EFFECT OF VANADIUM AND MOLYBDENUM ADDITIONS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF DUCTILE CAST IRON
THE EFFECT OF VANADIUM AND MOLYBDENUM ADDITIONS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF DUCTILE CAST IRON
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Date
2008-07
Authors
MUHAMMED, YAKUBU OZOVEHE
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Abstract
The effect of Vanadium and Molybdenum addition on the mechanical
properties of ductile cast iron has been investigated. Alloys of ductile cast
iron samples of varying additions of Vanadium and Molybdenum from 0.1-
0.3% were produced into cylindrical test bars by sand casting process using
“sandwiched” treatment method. Unalloyed ductile cast iron samples of the
same base metal composition were also produced to serve as control and
heat treatment samples. The heat treated samples were austenitized for the
purpose of normalizing, hardening and tempering. Results of the
mechanical properties revealed that tensile strength, yield strength and
hardness increased from 456, 307N/mm2 and 290BHN respectively for the
unalloyed samples to maximum values of 560, 407N/mm2 and 369BHN at
0.15% Vanadium addition and 562, 462N/mm2 and 362BHN at 0.15%
Molybdenum additions. Beyond 0.15% addition of both Vanadium and
Molybdenum led to decrease in values of some of the properties. The
impact values for the Molybdenum alloyed ductile iron increased with
Molybdenum addition, while that of Vanadium got to a maximum at 0.2%V
before decreasing. The heat-treated samples have higher tensile and
hardness values, they are however, inferior to the Vanadium and
Molybdenum alloys in terms of impact values. The yield strength of alloy
grades are in some cases higher than the heat treated grades.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA.
IN PARTIAL FULFILMENT FOR THE AWARD OF MASTERS
DEGREE IN METALLURGICAL ENGINEERING.
DEPARTMENT OF METALLURGICAL AND MATERIALS.
AHMADU BELLO UNIVERSITY, ZARIA. NIGERIA
JUNE, 2008
Keywords
VANADIUM,, MOLYBDENUM,, ADDITIONS, MICROSTRUCTURE,, MECHANICAL, DUCTILE CAST IRON