Development of Hypereutectoid Steel with Nodular Graphite

Dmytry S. Kozak

doi:10.4028/www.scientific.net/KEM.457.132

Paper Titles

Solidification Study of Gray Cast Iron in a Resistance Furnace
p.108

The Effect of Nitrogen and Inoculation on the Tensile Properties and Microstructure of Cast Iron with Lamellar Graphite
p.114

New Aspects Regarding the Structure of Spheroidal Cast Iron Carbon Inclusions Revealed by WAXD Investigations
p.120

The Influence of Alloying Elements on Chill Formation in CGI
p.126

Development of Hypereutectoid Steel with Nodular Graphite
p.132

Mechanism of Dissolved Sulfur Influence on the Transition from Graphite to Cementite Eutectic in Cast Iron
p.137

Characteristics of the Transformations Occurring within the Intercritical Interval of Ductile Iron
p.145

Pearlite Stabilisation by Copper on Ductile Cast Iron
p.151

Study of the Eutectoid Transformation in Grey Cast Irons and its Effect on Mechanical Properties
p.157

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Development of Hypereutectoid Steel with Nodular Graphite

Abstract:

This work studies the formation of cast structures in hypereutectoid steel modified by alloying modifiers (Fe30Si55Mg7Ca2REM4, Fe34Si55Mg9Ca2 and Fe63Ni30Mg7) together with inoculants Fe20Si60Ba20. It is found that at spheroidizing by 0.7 % Fe63Ni30Mg7 and inoculation by 1.5 % Fe20Si60Ba20 causes the formation of inclusions of nodular graphite with nodularity exceeding 90 % and a structurally-free cementite structure is obtained. The mechanical properties of the steel with nodular graphite modified by Fe63Ni30Mg7 and Fe20Si60Ba20 are as follows: tensile strength (σb) 660-680 МPа, yield strength (σ0.2) 520-540 МPа, percent elongation (δ) 5-8 %, impact strength (КС) 15-35 J/cm2, Brinell hardness (НВ) 241-255. After ferritic annealing these parameters were found to be σb =530-560 МPа, σ0.2=400-430 МPа, δ =20-24 %, КС=160- 180 J/cm2, 150-162 НВ.