Effect of single and double austenitization treatments on the microstructure and mechanical properties of 16Cr-2Ni steel |
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Authors: | K P Balan A Venugopal Reddy D S Sarma |
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Affiliation: | (1) Defence Metallurgical Research Laboratory PO-Kanchanbagh, 500 058 Hyderabad, India;(2) Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi, India |
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Abstract: | Double austenitization (DA) treatment is found to yield the best combination of strength and toughness in both low-temperature
as well as high-temperature tempered conditions as compared to single austenitization (SA) treatments. Obtaining the advantages
of double austenitization (DA) to permit dissolution of alloy carbides without significant grain coarsening was attempted
in AISI 431 type martensitic stainless steel. Structure-property correlation after low-temperature tempering (200 °C) as well
as high-temperature double tempering (650+600 °C) was carried out for three austenitization treatments through SA at 1000
°C, SA at 1070 °C, and DA at 1070+1000 °C. While the increase in strength after DA treatment and low-temperature tempering
at 200 °C is due to the increased amount of carbon in solution as a result of dissolution of alloy carbides during first austenitization,
the increased toughness is attributable to the increased quantity of retained austenite. After double tempering (650+600 °C),
strength and toughness are mainly found to depend on the precipitation and distribution of carbides in the microstructure
and the grain size effect. |
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Keywords: | 431 stainless double austenitization martensitic steel properties-stainless steel |
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