Investigation of the Ni-hard Cast Irons Microstructure and Properties after Modification

Two types of cast irons with Fe-C-Si and Fe-C-Al. alloy systems were investigated in the present study. In order to modify the microstructure and properties of cast iron, Al was added to low silicon pig iron that is in Fe-C-Al (Sorel metal) alloy system. Its effect was then studied with comparing to normal Fe-C-Si alloy system. Both cast irons were produced in sand mould of suitable design to provide all information regarding the structure and properties. The microstructure was analyzed using optical microscope which showed the distribution of graphite flakes in pearlite or ferro-pearlite matrix. The size of the graphite flakes in Fe-C-Al system was smaller and more evenly distributed compared to the Fe-C-Si alloy system. The cast product was also characterized by using XRD. The maximum hardness of the Fe-C-Al alloy was measured as 110.2 HRB compared to 89.32 HRB of the conventional Fe-C-Si alloy system. The impact test results showed that Fe-C-Al cast iron has higher impact property than Fe-C-Si cast iron.

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Microstructure and properties of monotectic Cr—Cu cast irons

Materials Science and Technology ◽

10.1179/026708301225000545 ◽

2002 ◽

Vol 18 (2) ◽

pp. 173-178

Author(s):

B. A. Kirievsky ◽

P. C. King ◽

E. V. Pereloma

Keyword(s):

Cast Irons ◽

Microstructure And Properties

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Microstructure and Properties of Ni-Based Alloy Coating with Ultrasonic Frequency Inductive Cladding on Substrate of Cast Irons

Materials Science Forum ◽

10.4028/www.scientific.net/msf.909.33 ◽

2017 ◽

Vol 909 ◽

pp. 33-38 ◽

Cited By ~ 1

Author(s):

Jing Yu ◽

Bo Song

Keyword(s):

Alloy Coating ◽

Immersion Test ◽

Polarization Measurement ◽

Ultrasonic Frequency ◽

X Ray Diffraction ◽

Cast Irons ◽

X Ray ◽

Microstructure And Properties ◽

Electron Image ◽

Backscattered Electron

Due to high content of carbon and poor weldability, the ultrasonic frequency induction cladding technique was utilized to fabricate Ni-based alloy coating on the substrate of gray cast irons. In order to investigate the microstructure and properties of Ni-based alloy coating, the techniques of optical microscopy (OM), backscattered electron image (BEI), X-ray diffraction (XRD) and Vickers microhardness tester were employed. And then the immersion test and potentiodynamic polarization measurement were performed to evaluate the corrosion behavior of Ni-based alloy coating. The experimental results reveal that the coating bonds metallurgically with the substrate. Due to the elemental interdiffusion between the coating and the substrate, a solid solution zone of coating is formed. The phases of γ-Ni, Ni3B, NiSi, chromium borides and carbides can be distinguished in the coating. Chromium borides and carbides are benefit for the improvement of hardness and NiSi provides good corrosion resistance.

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