Quantitative precipitation analysis using the Electrolysis extraction--Rietveld method for duplex stainless steel
It is usually difficult to quantitatively determine the mass fraction of each type of precipitates in steels using transmission electron microscopy and traditional X-ray powder diffraction analysis methods.Traditionally,electrolysis extraction-- chemical separation-- wet chemical test were combined to quantitative analysis precipitation phases.By chemical dissolution or selective electrolysis,sometimes,different precipitations could be separated and the mass of individual alloying elements of each precipitation phase could be determined.However,due to some precipitation phases were very similar and firm coalescent,they could not be separated totally by chemical method.Typically,our previous research had demonstrated that σphase was formed on the basis ofχphase in duplex stainless steel,and they were not separated independently but coexisting.In this paper,the Rietveld full-pattern fitting algorithm was employed to calculated the relative mass fractions of the precipitates in duplex stainless steel.The results suggested that the fractions of σphase,χ phase,carbide phase and nitride phase were evaluated precisely and relatively quickly.In addition,it was found that the cubic crystal χ phase was the molybdenum- rich inter-metallic compound phase,which was formed earlier thanσphase.The χ phase was metastable,and its amount gradually decreased with the prolonging of aging time.Furthermore,the σphase was developed from nothing and then gradually increased.
duplex stainless steel inter-metallic phases isothermal treatment quantitative analysis Rietveld
Miao Lede Zhang Yi Mi Xiaochuan
Research Institute,Baoshan Iron & Steel Co.Ltd.,Building 5,No.889 Fujin Road,Baoshan,Shanghai,201900,China
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-5
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）