Hot workability and microstructure control through the analysis of stress�strain curves during hot deformation of M350 grade maraging steel

Show simple item record Ansari, S. Syed Chakravarthi, K. V. A. Narayana Murty, S. V. S. Nageswara Rao, B. Mukhopadhyay, Jyoti 2019-06-29T06:04:57Z 2019-06-29T06:04:57Z 2019-06
dc.identifier.citation Ansari, S. Syed; Chakravarthi, K. V. A.; Narayana Murty, S. V. S.; Nageswara Rao, B. and Mukhopadhyay, Jyoti, “Hot workability and microstructure control through the analysis of stress–strain curves during hot deformation of M350 grade maraging steel”, Materials Performance and Characterization, DOI: 10.1520/MPC20190030, vol. 8, no. 5, Jun. 2019 en_US
dc.identifier.issn 2379-1365
dc.description.abstract The ultrahigh strength (2,400�MPa) 18Ni maraging steel (M350 grade) is widely used for critical structural applications, such as aircraft landing gears, in which the strength�toughness balance is the essential criterion for material selection. Microstructure control during thermomechanical processing is the key to obtain the desired mechanical properties on a repeatable basis in a manufacturing environment. This involves thorough understanding of the hot deformation behavior under a wide range of temperatures and strain rates to map the microstructural evolution as a function of process parameters to obtain defect-free products. Towards achieving this goal of optimization of hot workability with a view to control microstructure for M350 grade maraging steel, hot deformation processing maps have been developed and correlated to the microstructure evolved. Further, analysis of stress�strain curves was carried out to obtain fine prior austenite grain (PAG) size via discontinuous dynamic recrystallization, and the same was verified experimentally by the microstructures evolved through hot isothermal compression tests on cylindrical specimens subjected to different strain levels. A single peak DRX type�?????�curve was selected for analyses. The theoretically determined critical strain value was verified experimentally for initiation of DRX (DRXI) and transition from DRX dominant region to grain growth dominant region (DRXT). Hot isothermal compression tests have been conducted at�T?=?950�C and ?, ?, , =, 0.01, ?, s, ?, 1, , , , , , and obtained PAG size of 3.14 �m in the specimen deformed to theoretically determined optimum strain of 0.74, thereby validating the used models.
dc.description.statementofresponsibility by S. Syed Ansari, K. V. A. Chakravarthi, S. V. S. Narayana Murty, B. Nageswara Rao and Jyoti Mukhopadhyay
dc.format.extent vol. 8, no. 5
dc.language.iso en en_US
dc.publisher American Society for Testing and Materials en_US
dc.subject Hot deformation en_US
dc.subject processing map en_US
dc.subject activation energy en_US
dc.subject flow stress en_US
dc.subject constitutive relation en_US
dc.subject maraging steel en_US
dc.title Hot workability and microstructure control through the analysis of stress�strain curves during hot deformation of M350 grade maraging steel en_US
dc.type Article en_US
dc.relation.journal Materials Performance and Characterization

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