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Title: Development of nano-structured duplex and ferritic stainless steels by pulverisette planetary milling followed by pressureless sintering

Nano-structured duplex and ferritic stainless steel powders are prepared by planetary milling of elemental Fe, Cr and Ni powder for 40 h and then consolidated by conventional pressureless sintering. The progress of milling and the continuous refinement of stainless steel powders have been confirmed by means of X-ray diffraction and scanning electron microscopy. Activation energy for the formation of duplex and ferritic stainless steels is calculated by Kissinger method using differential scanning calorimetry and is found to be 159.24 and 90.17 KJ/mol respectively. Both duplex and ferritic stainless steel powders are consolidated at 1000, 1200 and 1400 °C in argon atmosphere to study microstructure, density and hardness. Maximum sintered density of 90% and Vickers microhardness of 550 HV are achieved for duplex stainless steel sintered at 1400 °C for 1 h. Similarly, 92% sintered density and 263 HV microhardness are achieved for ferritic stainless steel sintered at 1400 °C. - Highlights: • Synthesized duplex and ferritic stainless steels by pulverisette planetary milling • Calculated activation energy for the formation of duplex and ferritic stainless steels • Studied the effect of sintering temperature on density, hardness and microstructure • Duplex stainless steel exhibits 90% sintered density and microhardness of 550 HV.more » • Ferritic stainless steel shows 92% sintered density and 263 HV microhardness.« less
Authors:
;
Publication Date:
OSTI Identifier:
22476019
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 99; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; CALORIMETRY; CHROMIUM ADDITIONS; DENSITY; FERRITIC STEELS; IRON ADDITIONS; MICROHARDNESS; MICROSTRUCTURE; NANOSTRUCTURES; NICKEL ADDITIONS; PHASE TRANSFORMATIONS; POWDER METALLURGY; POWDERS; SCANNING ELECTRON MICROSCOPY; SINTERING; STAINLESS STEELS; TEMPERATURE RANGE 1000-4000 K; X-RAY DIFFRACTION