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The Effects of Composition and Thermal Path on Hot Ductility of Forging Steels

Connolly, Brendan (2017) The Effects of Composition and Thermal Path on Hot Ductility of Forging Steels. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

This work examines the effects of composition and thermal path on the hot ductility of several forging steels with varied aluminum and nitrogen content. The primary mechanisms and controlling factors related to hot ductility are identified with a focus on the role of precipitates and segregation. The unique thermal paths and solidification structures of large cross-section forging ingots are discussed. Hot ductility testing is performed in a manner that approximates industrial conditions experienced by large cross-section forging ingots. A computer model for precipitation of aluminum nitride and vanadium nitride in austenite is presented. Industrial material is examined for comparison to experimental findings. It is found that increased aluminum and nitrogen content coarsens the as-solidified structure. The combined effects of microsegregation and uphill diffusion during deformation allow for carbide precipitation at prior austenite grain boundaries which reduces the hot ductility.

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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Connolly, Brendanconnolly@elwd.comBMC40
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairDeArdo, Anthonydeardo@pitt.edu
Committee MemberNettleship, Iannettles@pitt.edu
Committee MemberOyler, Johnoyler1@pitt.edu
Committee MemberWiezorek, Jorgwiezorek@pitt.edu
Committee MemberMao, Scottsxm2@pitt.edu
Date: 1 February 2017
Date Type: Publication
Defense Date: 3 November 2016
Approval Date: 1 February 2017
Submission Date: 13 November 2016
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 185
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Steel As-cast Segregation Hot Ductility
Additional Information: Updated version to include corrected bookmarks
Date Deposited: 01 Feb 2017 20:45
Last Modified: 02 Feb 2017 06:15
URI: http://d-scholarship.pitt.edu/id/eprint/30299

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