Effect of Nanosize Yittria and Tungsten Addition to Duplex Stainless Steel During High Energy Planetary Milling

被引：28

作者：

Nayak, A. K. ^{[1
]}

Shashanka, R. ^{[1
]}

Chaira, D. ^{[1
]}

机构：

[1] Natl Inst Technol Rourkela, Dept Met & Mat Engn, Rourkela 769008, Odisha, India

来源：

5TH NATIONAL CONFERENCE ON PROCESSING AND CHARACTERIZATION OF MATERIALS | 2016年 / 115卷

关键词：

Mechanical alloying; DDPM; Annealing; Phase transformation; DSC; STRUCTURED DUPLEX; MICROSTRUCTURE; POWDERS;

D O I：

10.1088/1757-899X/115/1/012008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this present investigation, elemental powders of duplex stainless steel composition (Fe-18Cr-13Ni) with 1 wt. % nano yittria and tungsten were milled separately in dual drive planetary mill (DDPM) for 10 h to fabricate yittria dispersed and tungsten dispersed duplex stainless steel powders. The milled powder samples were characterized by X-Ray diffraction and scanning electron microscopy (SEM) to study the size, morphology and phase evolution during milling. The gradual transformation from ferrite to austenite is evident from XRD spectra during milling. The crystallite size and lattice strain of yittria dispersed duplex stainless steel after 10 h milling were found to be 7 nm and 1.1% respectively. The crystallite size of tungsten dispersed duplex stainless steel was 5 nm. It has been observed from SEM analysis that particles size has been reduced from 40 to 5 mu m in both cases. Annealing of 10 h milled powder was performed at 750 degrees C for 1 h under argon atmosphere to study phase transformation in both yittria and tungsten dispersed duplex stainless steel. The XRD analysis of annealed stainless steel depicts the phase transformation from alpha-Fe to gamma-Fe with the formation of oxides of Y, Fe and Cr. The differential scanning calorimetry analysis was conducted by heating the milled powder from room temperature to 1200 degrees C under argon atmosphere to investigate the thermal analysis of both the stainless steel powders.

引用

页数：9

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