Study On Corrosion Resistance,wear Resistance And Thermal Conductivity Of Fe-based Amorphous Alloy Based On 430 Stainless Steel

In this paper,?430?_62+x(Fe_14.75C_32.22Mo_28.03B_19.44Y_5.56)_38-x?x=0,2,4,6wt%;BMG1,BMG2,BMG3,BMG4?and Fe_57.47-xCr_11.84+xMo_10.09C_11.6B₇Y₂?x=0,2,4,6at%;BMG5,BMG6,BMG7,BMG8?amorphous alloys were fabricated using the non-consumable type vacuum arc melting furnace water-cooled copper mold suction casting method.The structure and thermal stability of amorphous alloys were characterized by X-ray diffraction?XRD?and differential scanning calorimeter?DSC?.The corrosion resistance of amorphous alloys were analyzed by electrochemical and EIS techniques.Wear-resisting properties and thermal conductivity of amorphous alloys were studied using WTM-2E friction and wear tester and laser flicker thermal conductivity meter.The surface morphology after worn and vibration performances of clusters were analyzed by scanning electron microscopy?SEM?and Raman spectra respectively.This paper mainly focuses on the design of the components of the Fe-based amorphous alloy with a wide window and excellent performances.The influence of the quality ratio of 430 stainless steel and alloy powder,named M,and Fe/Cr ratio on the corrosion resistance of Fe-based amorphous alloys in 1mol/L HCl,1mol/L NaOH and3.5%NaCl solution was discussed.The relationship between the corrosion resistance of Fe-based amorphous alloy in 3.5%NaCl solution and its vibration performances of the cluster was discussed,in order to establishing the relationship between the vibration performances of the cluster and the corrosion resistance of Fe-based amorphous alloys.Furthermore,the influence of M value and the ratio of Fe/Cr on wear resistance and thermal conductivity of Fe-based amorphous alloys were also discussed.The results of DSC show that the thermal stability of Fe-based amorphous alloy decreases first and then increases with the increase of M value and decreases gradually with the increase of Fe/Cr ratio.The results of electrochemical and AC impedance spectroscopy show that when the M value was in the range of 1.63².13,the corrosion resistance of Fe-based amorphous alloys in 1mol/L HCl and 3.5%NaCl solution was better than 430 stainless steel and was slightly weaker than 430 stainless steel in1mol/L NaOH solution.When the ratio of Fe/Cr was 4.01,the corrosion resistance of BMG6 in three solutions was all best.The M-S curves show that when the potential was in the range of 0¹.0V,Fe-based amorphous alloys has the typical characteristic of n-type semiconductor in 3.5%NaCl solution.When the M value was 1.78,the density of the passivation film of the BMG2 was the best.The results of Raman spectra show that the wavenumbers of the cluster decrease first and then increase and decrease again with the increase of Fe/Cr ratio and take on a negative correlation with the passivation current densities of Fe-based amorphous alloy in the 3.5%%NaCl solution and satisfied with the formula y=1.6168+0.005420)235.2.The friction and wear results show that the wear resistance of Fe-based amorphous alloys was gradually decline with the increase of M value,but it was better than 430 stainless steel.The wear resistance of the Fe-based amorphous alloy with different Fe/Cr ratio was not significant and its wear resistance was increased first and then weakened with the increase of Fe/Cr ratio,when the Fe/Cr ratio was 3.38,the wearing coefficient of BMG7 was the least and the wear resistance was the best.The wearing mechanism of Fe-based amorphous alloy was mainly fatigue wear and small amount of adhesive wear,and the adhesive wear was occurred on 430 stainless steel.When the temperature was in the range of 298⁴73K,the thermal conductivity and thermal diffusivity coefficient of Fe-based amorphous alloy were gradually rise with the increase of temperature,when the M value was 1.78 and 2.13,the thermal conductivity and thermal diffusivity coefficient of Fe-based amorphous alloys reach the maximum value respectively.When the temperature was in the range of 298³23K,the influence of Fe/Cr ratio on the thermal conductivity of Fe-based amorphous alloy was less.When the temperature was in the range of 323⁴73K,the thermal conductivity of Fe-based amorphous alloy increase first and then decrease and increase again with the increase of Fe/Cr ratio,the thermal diffusivity coefficient decreases first and then increase.The components of Fe-based amorphous alloy with wide window and excellent performances were obtained by adjusting the M value.Considering the properties and cost of amorphous alloy,the composition of BMG2 was the best for arc surfacing method.When the Fe/Cr ratio was 4.01,BMG6 has excellent comprehensive performances and good economic benefit.