Effect of forging strain rate and deformation temperature on the mechanical properties of warm-worked 304L stainless steel

Journal Article · Mon Jan 25 04:00:00 EST 2010 · Journal of Materials Processing Technology

DOI:https://doi.org/10.1016/j.jmatprotec.2010.01.014· OSTI ID:1074141

Switzner, N. T. ^[1]; Van Tyne, C. J. ^[2]; Mataya, M. C. ^[2]

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1. Honeywell Federal Manufacturing & Technologies, Kansas City, MO (United States)
2. Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering

Stainless steel 304L forgings were produced with four different types of production forging equipment – hydraulic press, mechanical press, screw press, and high-energy rate forging (HERF). Each machine imparted a different nominal strain rate during the deformation. The final forgings were done at the warm working (low hot working) temperatures of 816 °C, 843°C, and 871°C. The objectives of the study were to characterize and understand the effect of industrial strain rates (i.e. processing equipment), and deformation temperature on the mechanical properties for the final component. Some of the components were produced with an anneal prior to the final forging while others were deformed without the anneal. The results indicate that lower strain rates produced lower strength and higher ductility components, but the lower strain rate processes were more sensitive to deformation temperature variation and resulted in more within-part property variation. The highest strain rate process, HERF, resulted in slightly lower yield strength due to internal heating. Lower processing temperatures increased strength, decreased ductility but decreased within-part property variation. The anneal prior to the final forging produced a decrease in strength, a small increase in ductility, and a small decrease of within-part property variation.

• Research Organization: Kansas City Plant (KCP), Kansas City, MO (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC04-01AL66850
• OSTI ID: 1074141
• Report Number(s): KCP--613-8712
• Journal Information: Journal of Materials Processing Technology, Journal Name: Journal of Materials Processing Technology Journal Issue: 8 Vol. 210; ISSN 0924-0136
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Deformation temperature
Mechanical properties
Strain rate
Warm working