• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2018 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2018 - Mines Theses & Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Mines RepositoryCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    Login

    Mines Links

    Arthur Lakes LibraryColorado School of Mines

    Statistics

    Display Statistics

    Heat treating response of 0.6 C steels for saw chain applications

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Youngblood_mines_0052N_11574.pdf
    Size:
    15.32Mb
    Format:
    PDF
    Download
    Author
    Youngblood, Ronald C.
    Advisor
    Speer, J. G.
    Date issued
    2018
    Keywords
    austenite
    quenching and partitioning
    wear
    hardness
    austempering
    steel
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/172560
    Abstract
    Steels used in saw chain applications require a combination of strength, toughness, and wear resistance. The focus of this project is to develop improved steels for saw chain applications by utilizing alloying and processing techniques to improve upon the current generation of saw chain steels. This is accomplished by studying the relationship between heat treatment processing and the corresponding microstructures and properties of two medium carbon low alloy steels. The first alloy is designated OCS 01 and is similar to a lean alloyed 8660 steel. The second alloy is a high silicon 9260 alloy, chosen for its ability to produce austenite containing microstructures in the carbon and hardness range of interest for current saw chain steels. Austempering, quenching and tempering (Q&T), and quenching and partitioning (Q&P) (9260 only) processing methods were simulated. For Q&P processing, the volume fraction of retained austenite decreased with time at higher partitioning temperatures, due to decomposition of the austenite to ferrite and iron carbides. Higher austempering temperatures decreased the time to reach bainitic transformation stasis, and increased the volume fraction of retained austenite. The austenite carbon content increased with time for each Q&P partitioning temperature evaluated. Vickers hardness measurements showed a consistent decrease in hardness with increased time and temperature when partitioning or tempering, as well as a decrease in hardness with increased isothermal austempering temperature. Charpy impact testing showed that the Q&P processing conditions of the 9260 alloy offer a significant improvement in Charpy impact energy absorbed at room and low ( 29 °C ( 20 °F)) temperature when compared to the 9260 austempered and Q&T conditions at equivalent hardness. DSRW wear testing showed that the Q&P 9260 conditions have improved low-impact abrasive wear resistance at equivalent hardness when compared to all other conditions evaluated. 9260 Q&P conditions had greater combinations of wear performance and Charpy impact performance when compared to the austempered and Q&T 9260 conditions. Tensile testing results showed that select 9260 processing conditions offer improved tensile properties (yield strength, peak stress, uniform elongation, and/or total elongation) when compared to the OCS-01 processing conditions. Increased amounts of retained austenite were observed to increase the total elongation of 9260 Q&P conditions, and increase the product of tensile strength and total elongation. A 9260 Q&P condition was identified, which offers improved combinations of tensile strength, uniform elongation, total elongation, and wear performance when compared to the OCS-01 conditions evaluated.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2018 - Mines Theses & Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2023)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.