Evolution of the microstructure and mechanical properties of interstitial-free steel during multi-axial diagonal forging

In this study, sound workpieces made of interstitial-free (IF) steel were manufactured by performing up to 4 cycles without the occurrence of forging defects via the use of a new multi-axis diagonal forging (MADF-ver2) process at room temperature. The microstructure that was developed in the deforme...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-06, Vol.846, p.143242, Article 143242
Main Authors: Kim, Min-Seong, Kim, Jeong Gyun, Kwon, Sang-Chul, Jeong, Do Heon, Lee, Seong, Jeong, Hyo-Tae, Choi, Shi-Hoon
Format: Article
Language:English
Subjects:
Crystal defects
Deformation
Dislocation density
Elongated structure
Forging
Grain boundaries
Grain size
Hardness
IF steel
Interstitial free steels
Mechanical properties
Mechanical property
Microstructure
Misalignment
Multi-axial diagonal forging
Recovery
Room temperature
Ultrafines
Workpieces
Yield strength
Yield stress
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Summary:In this study, sound workpieces made of interstitial-free (IF) steel were manufactured by performing up to 4 cycles without the occurrence of forging defects via the use of a new multi-axis diagonal forging (MADF-ver2) process at room temperature. The microstructure that was developed in the deformed specimens was experimentally analyzed and compared. As the number of cycles increased, the average grain size gradually decreased, and both the average misorientation angle and the fraction of high-angle grain boundaries (HAGBs) continued to increase. As the number of cycles increased, the change in average geometrically necessary dislocation (GND) density was insignificant due to the occurrence of dynamic recovery. The effects of microstructural factors on the hardness, yield strength, and total elongation of the deformed specimens were investigated. The ultrafine-grained structure formed by MADF-ver2 continuously increased the hardness and yield strength with increases in the number of cycles. On the other hand, total elongation was not dependent on the number of cycles, and this independence was mainly the result of insignificant changes in the average GND density due to the dynamic recovery that occurred throughout the specimen.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2022.143242