A study of nickel influence on the promotion of ausferrite formation in Fe-Mo-Mn-Si-C-Ni sintered composites

Name: Zayar Min Htike

LCSH: Sintering

LCSH: Founding

LCSH: Metals -- Microstructure

LCSH: Metals -- Mechanical properties

Abstract: It is generally accepted that austempered ductile irons have mechanical properties promising for engineering applications. Recently, it has been found that it is possible to introduce austempered ductile iron microstructure to a sintered composite. Such introduction will not only improve sintered composite performance but also expand the applications of sintered materials. It was reported previously that sintered Fe-Mo-Mn-Si-C composite, produced from powder mixture of pre-alloyed Fe-1.50Mo- 0.15Mn and 4.0 wt.% silicon carbide, showed microstructural feature consisting of black particles enveloped with ferrite halos, pearlite and ausferrite. เท this work, it was hypothesized that the addition of austenite stabilizing elements would promote ausferrite fraction in sintered Fe-Mo-Mn-Si-C composite. Nickel was selected for this experimental work. It was found that nickel addition resulted in the replacement of pearlite by ausferrite. The sintered composite added with 1.0 wt.% nickel showed dual phase austempered ductile iron microstructure, i.e., the microstructural feature consisting of black particles enveloped with ferrite halos and ausferrite. The sintered composite added with 2.0 wt.% nickel showed austempered ductile iron microstructure, i.e., the microstructural feature consisting of black particles enveloped with ausferrite. Tensile properties of sintered composites were controlled by microstructural components. Among all experimental specimens, the sintered composite added with 1.0 wt.% nickel showed optimum tensile properties

King Mongkut's Institute of Technology Ladkrabang. KMITL Lifelong Learning Center

Address: BANGKOK

Email: lifelong@kmitl.ac.th

Name: Jittraporn Wongsa-Ngam

Role: Thesis Advisor

Email : jittraporn.wo@kmitl.ac.th

Name: Ruangdaj Tongsri

Role: Thesis Co-Advisor

Modified: 2025-10-02

Created: 2024

Issued: 2025-10-02

วิทยานิพนธ์/Thesis

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