Show/Hide Menu
Hide/Show Apps
anonymousUser
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Frequently Asked Questions
Frequently Asked Questions
Browse
Browse
By Issue Date
By Issue Date
Authors
Authors
Titles
Titles
Subjects
Subjects
Communities & Collections
Communities & Collections
Effect of heat treatment on microstructural and mechanical properties of molybdenum based PM ferrous alloys
Download
index.pdf
Date
2016
Author
Davoudnezhad, Ramona
Metadata
Show full item record
Item Usage Stats
3
views
0
downloads
In this study, the effect of different heat treatment processes on microstructural and mechanical properties of Distaloy-DH and Astaloy Mo (Fe-2Cu-1.5Mo) powders are investigated. Powder samples are sintered at 1120°C for 45 minutes in a sintering furnace under reducing atmosphere of: 10% H2 + 90% N2. After sintering, secondary heat treatments are performed on samples. Microstructural characterization of samples is done with optical and electron microscopy. Selective etching is utilized for determining the amount of bainite and martensite in samples. The Distaloy-DH samples yield approximately 1.9% less porosity than Astaloy Mo samples. In all specimens, pearlite, bainite and/or mixture of martensite and bainite phases are obtained based on the isothermal holding temperature or cooling rate from the austenite region. The study revealed that the specimens with martensitic and lower bainitic microstructure yield high TRS values with respect to either pearlitic or upper bainitic microstructures. Moreover, the lower bainitic structures yield similar or higher TRS values with respect to martensitic structures even at lower hardness values.
Subject Keywords
Iron alloys.
,
Molybdenum.
,
Powder metallurgy.
,
Metals
URI
http://etd.lib.metu.edu.tr/upload/12619800/index.pdf
https://hdl.handle.net/11511/25485
Collections
Graduate School of Natural and Applied Sciences, Thesis