Resetting microstructures and properties in TRIP-assisted advanced high strength steels

Metals are widely used structural materials in automotive, packaging, construction, and machines. Driven by demands to decrease greenhouse gas emissions, the reuse, re-forming, and re-manufacturing of metals draws great attention. However, current processes such as mechanical joining, welding, coating, etc. have key practical and theoretical limitations. Recently, a new reuse strategy is proposed, which aims to reset the microstructures of materials to maintain performance and increase lifetime. We refer to alloys that demonstrate this capability as resettable alloys. One resettable alloy is the transformation-induced plasticity-maraging (TRIP-maraging) steel. However, current resettable TRIP-maraging steels require long and unfeasible resetting treatments. The limit of resetting kinetics has not been reached and the microstructure resetting mechanism has not been fully understood. Here we focus on providing a deeper understanding of the resetting mechanism in TRIP-maraging steel, such as the effects of composition and pre-strain, to increase the kinetics of the underlying transformations. This study demonstrates that with proper microstructure design, the resetting process could be completed within minutes following a critical level of deformation.

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Mechanical Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2018

Author dc:creator

• Jiang, Menglei (Scientist in mechanical engineering) Massachusetts Institute of Technology

Advisor dc:contributor.advisor

• C. Cem Tasan.

• Mechanical Engineering.

Statement dc:rights

• MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/118713

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/118713