Causes of variation in properties of castings conforming to BS4844: 1986 grade 3D high chromium white cast iron

S. Bhero, S. Mavhungu

Research output: Contribution to conferencePaper

Abstract

High chromium iron castings have been observed to exhibit significantly varying mechanical properties. To establish the origin of inconsistencies in properties, the research was conducted in two phases. First, monitoring to maintain consistency of charge materials and pouring temperature in order to eliminate extraneous operational variables from causative factors. Second, microstructural variations and consistency in mechanical properties were characterised and compared for different heats with small deviations in chemical compositions within the specification BS4844:1986 Grade 3D of high chromium white cast iron. The investigation revealed that marked inhomogeneity of microstructure as a result of variation in particularly chemical composition as well as operational parameters such as inconsistencies in pouring temperatures. The solution to this problem lies in narrowing the specification range by raising the lower limits to 2.5% C and 25% Cr, as well as controlling the pouring temperature to around 1550oC and reducing solidification time as much as possible. © 2017 TANGER Ltd., Ostrava.
Original languageEnglish
Pages109-116
Number of pages8
Publication statusPublished - 2017

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chromium
iron
mechanical properties
chemical composition
solidification
temperature
microstructure
heat
monitoring

Cite this

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title = "Causes of variation in properties of castings conforming to BS4844: 1986 grade 3D high chromium white cast iron",
abstract = "High chromium iron castings have been observed to exhibit significantly varying mechanical properties. To establish the origin of inconsistencies in properties, the research was conducted in two phases. First, monitoring to maintain consistency of charge materials and pouring temperature in order to eliminate extraneous operational variables from causative factors. Second, microstructural variations and consistency in mechanical properties were characterised and compared for different heats with small deviations in chemical compositions within the specification BS4844:1986 Grade 3D of high chromium white cast iron. The investigation revealed that marked inhomogeneity of microstructure as a result of variation in particularly chemical composition as well as operational parameters such as inconsistencies in pouring temperatures. The solution to this problem lies in narrowing the specification range by raising the lower limits to 2.5{\%} C and 25{\%} Cr, as well as controlling the pouring temperature to around 1550oC and reducing solidification time as much as possible. {\circledC} 2017 TANGER Ltd., Ostrava.",
author = "S. Bhero and S. Mavhungu",
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year = "2017",
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Causes of variation in properties of castings conforming to BS4844: 1986 grade 3D high chromium white cast iron. / Bhero, S.; Mavhungu, S.

2017. 109-116.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Causes of variation in properties of castings conforming to BS4844: 1986 grade 3D high chromium white cast iron

AU - Bhero, S.

AU - Mavhungu, S.

N1 - Export Date: 15 June 2018

PY - 2017

Y1 - 2017

N2 - High chromium iron castings have been observed to exhibit significantly varying mechanical properties. To establish the origin of inconsistencies in properties, the research was conducted in two phases. First, monitoring to maintain consistency of charge materials and pouring temperature in order to eliminate extraneous operational variables from causative factors. Second, microstructural variations and consistency in mechanical properties were characterised and compared for different heats with small deviations in chemical compositions within the specification BS4844:1986 Grade 3D of high chromium white cast iron. The investigation revealed that marked inhomogeneity of microstructure as a result of variation in particularly chemical composition as well as operational parameters such as inconsistencies in pouring temperatures. The solution to this problem lies in narrowing the specification range by raising the lower limits to 2.5% C and 25% Cr, as well as controlling the pouring temperature to around 1550oC and reducing solidification time as much as possible. © 2017 TANGER Ltd., Ostrava.

AB - High chromium iron castings have been observed to exhibit significantly varying mechanical properties. To establish the origin of inconsistencies in properties, the research was conducted in two phases. First, monitoring to maintain consistency of charge materials and pouring temperature in order to eliminate extraneous operational variables from causative factors. Second, microstructural variations and consistency in mechanical properties were characterised and compared for different heats with small deviations in chemical compositions within the specification BS4844:1986 Grade 3D of high chromium white cast iron. The investigation revealed that marked inhomogeneity of microstructure as a result of variation in particularly chemical composition as well as operational parameters such as inconsistencies in pouring temperatures. The solution to this problem lies in narrowing the specification range by raising the lower limits to 2.5% C and 25% Cr, as well as controlling the pouring temperature to around 1550oC and reducing solidification time as much as possible. © 2017 TANGER Ltd., Ostrava.

M3 - Paper

SP - 109

EP - 116

ER -