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Production of lamellar cast iron EN-GJL-150 from local manganese-rich pig iron by modification of the melting process

Sitouah Noureddine, Cherfi Abdelhamid, Oualit Mehena, Zerizer Abdellatif

Advances in Materials Science

2022

Vol. 22, nr 4(74)

69--84

In the present study, a modified duplex melting process was set up so as to be able to produce an EN-GJL-150 gray cast iron from a local manganese-rich pig iron. A descriptive statistics showed an average Mn and Si content in raw material such that: Mn % = 2.457±0.133 and Si % = 0.682±0.088. The demanganization process was run and monitored in a cascade of two industrial-scale furnaces: a rotary kiln and an electric arc furnace. The performed experiments indicated that: 1) the manganese content decreased from 2.45 % to 0.94 %, 2) the manganese oxidation obeys the first order kinetic model, 3) Brinell and Rockwell hardness’s decreased by 38.83% and 27.81% respectively, and 4) the produced cast iron has a pearlitic microstructure with a small fraction of ferrite (1 to 5%) in the matrix and traces of cementite. All results showed that the produced castings comply with the standards in force for EN-GJL-150 cast irons, similar to gray cast iron ASTM A48 Class 20.

Comparison of impact delaminations in CFRP using different test methods

Ehrlich I., Dinnebier H., Jost C.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 73, nr 2

128--138

Purpose: of this paper is comparison of impact delaminations in CFRP using different test methods. Design/methodology/approach: A comparison is made between the results of well-established techniques such as Ultrasonic Testing or micrographic cross-sections with the results of Microfocus Computed X-Ray Tomography. Findings: The findings show that both Ultrasonic Testing and μCT show a linear correlation between impact energy and delaminated area. However, μCT is able to detect significantly larger delaminated areas. Other findings were that the undamaged zone immediately underneath the contact point of the impactor is not a cylinder but a cone segment. The higher density of that compacted area could also be visualized. Research limitations/implications: The correlation between main impact parameters could be shown on the base of state of the art non-destructive testing. Originality/value: Impact delaminations in carbon fiber reinforced plastic have generated in a well-defined manner and a comparison is made between the results of well-established techniques such as Ultrasonic Testing (UT) or micrographic cross-sections with the results of Microfocus Computed X-Ray tomography (μCT).