Microstructure mechanical properites and wear behavior of sintered Fe-Mo-Mn-Si-C self-lubricating composites

Name: Thunyamon Nithimethakul

LCSH: Iron -- Metallurgy

LCSH: Metals -- Mechanical properties

LCSH: Composite materials

Abstract: In recent year, powder metallurgy (PM) has been widely used for producing aerospace, marine and automotive composite parts due to versatile ability of PM process to combine various types of reinforcements and matrices. One promissing sintered composite type is a self-lubricating material, with a high mechanical strength and wear properties of low friction coefficient and wear rate. A sintered seld-lubricating composite has high potential for tribological applications because it has solid lubricant particles embbeded in a matrix. In this work, self-lubricating composites, metal matrix composites embedded with in-situ generated solid lubricant particles, were prepared from different iron and iron alloy powders, such as Fe, Fe-0.50Mo-0.15Mn, Fe-0.85Mo-0.15Mn and Fe-1.50Mo-0.15Mn powder, mixed with fixed 4 wt. % silicon carbide powder. All experimental sintered composites were processed by using uniaxial die pressing and sintering method. It was revealed that the common microstructural feature of the sintered Fe-Si-C composite consisted of a black particle enveloped with ferrite and pearlite. For Mo-containing sintered composites, they showed different matrices. With 0.5 wt.% Mo, the sintered composite had the same microstructural feature as the sintered Fe-Si-C composite. With 0.85 and 1.50 wt.% Mo, the sintered composite matrices showed ausferrite (bainitic ferrite + austenite) coexisting with pearlite. The fraction of ausferrite increased with increasing Mo content. The refinement of pearlite interlamellar spacing had strong influence on hardness of sintered composites. The increase fraction of pearlite + ausferrite led to the increase of tensile strength. It was revealed that friction coefficient and wear rate of sintered composites decreased with increasing fractions of black particles and increasing mechanical strength and hardness

King Mongkut's Institute of Technology Ladkrabang. Central Library

Address: BANGKOK

Email: Lifelong@kmitl.ac.th

Name: Preechar Karin

Role: Thesis Advisor

Name: Ruangdaj Tongsri

Role: Thesis Co-Advisor

Created: 2021

Modified: 2023-01-17

Issued: 2023-01-17

วิทยานิพนธ์/Thesis

application/pdf

eng

Level: Master's Degree

Descipline: Automotive Engineering

Grantor: King Mongkut's Institute of Technology Ladkrabang

DegreeName: Master of Engineering

©copyrights King Mongkut's Institute of Technology Ladkrabang

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	Thunyamon Nithimethakul.pdf	10.92 MB	1	2023-01-17 15:52:42

ใช้เวลา

0.033132 วินาที