Synthesis of High Nitrogen Stainless Steel Powders by High Energy Ball Milling and their SPS Compaction

Da Wei Cui; Jin Long Wang

doi:10.4028/www.scientific.net/AMR.97-101.1142

Paper Titles

Preparation and Mechanical Properties of Al₂O₃/TiCN Sandwich Nanocomposite Ceramic Tool Materials
p.1126

Carbon Foams with High Compressive Strength Derived from Mixtures of Mesophase Pitch and Si Particles
p.1130

Study on Friction Properties of Cu-Based Friction Materials with Ni Coated Nano-SiO₂ Particles
p.1134

Synthesis of α-Al₂O₃ Platelets in Molten Salt for High Performance Ceramics
p.1138

Synthesis of High Nitrogen Stainless Steel Powders by High Energy Ball Milling and their SPS Compaction
p.1142

System Design for High Energy Rate Electromagnetic Powder Compaction Devices
p.1146

An Experimental Study of Fine Powder Comminution in a Dual Cone Impact Mill
p.1150

Research of Constitutive Relation of Metal Powder in High Velocity Compaction
p.1154

Research on Manufacturing Technology and Heat Transfer Characteristics of Sintered Porous Surface Tubes
p.1161

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 97-101Synthesis of High Nitrogen Stainless Steel Powders...

Synthesis of High Nitrogen Stainless Steel Powders by High Energy Ball Milling and their SPS Compaction

Abstract:

High nitrogen nanostructured Fe-17Cr-11Mn-3Mo stainless steel powders were produced by high energy ball milling under a nitrogen atmosphere. It was found with increasing the milling time, the nitrogen contents of the powder mixtures increase linearly up to 1.98 wt pct after 96h, and a linear regression equation, WN = 0.19357 + 0.01887t , has been further established. In addition, with the increased milling time, the crystallite sizes and particle sizes of the powders decrease continuously, the lattice strains and sphericity of the powders increase gradually. After milling 60h, the high nitrogen nanocrystalline stainless steel powders with a fine particle size range of 5~10μm, excellent sphericity and uniform components can be obtained, whose crystallite size is about 5.0nm and lattice strain is about 1.0%. The powders milled for 60h was compacted using spark plasma sintering process at different temperatures. It is found that a fully austenitic high nitrogen stainless steel with almost full densification can be obtained by SPS at 1000°C, whose nitrogen content is 0.82 wt pct.