摘要:
基于FactSage热力学软件的最小吉布斯自由能原理,研究了不同[Ca]、[Mg]、[Al]、[O]含量条件下GCr15轴承钢凝固过程中夹杂物的析出行为。结果表明:随着[Ca]含量由0.000 5%增加至0.004 5%,轴承钢中析出的夹杂物类型由CaO·2MgO·8Al2O3、CaO·2Al2O3向2CaO·SiO2、Ca S转变,钢中夹杂物总质量分数由约0.004 5%增加到约0.009 4%。随着[Mg]含量从0.000 1%增加到0.000 9%,钢中析出的夹杂物由CaO·Al2O3、2CaO·SiO2向MgO·Al2O3和Ca S转变,钢中夹杂物总质量分数由约0.003 2%增加到约0.004 1%;[Al]含量由0.005%增加至0.05%时,钢中析出的夹杂物类型由2CaO·SiO2向CaO·Al2O3、CaO·2Al2O3转变,夹杂物总量由0.002 8%增加至0.003 3%,变化相对不明显;随着[O]含量由0.000 3%增加至0.002 1%,钢中析出的夹杂物类型由CaS向CaO·Al2O3、CaO·2Al2O3转变,夹杂物析出量由0.002 4%增加到约0.005 1%。
关键词:
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轴承钢 /
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组分 /
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夹杂物 /
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热力学
Abstract:
The evolution of non-metallic inclusions in the GCr15 bearing steel during solidification with different content of[Ca],[Al],[O]and[Mg]was investigated by Fact Sage software which is based on minimum Gibbs free energy principle.The results showed that the inclusion types changed from CaO·2MgO·8Al2O3,CaO·2Al2O3 to 2CaO·SiO2,Ca S,meanwhile,the total mass fraction of inclusions increased from 0.004 5% to 0.009 4% with the Ca content increased from 0.000 5% to 0.004 5%.With the Mg content increased from0.000 1% to 0.000 9%,inclusion types changed from CaO·Al2O3,2CaO·SiO2 to MgO·Al2O3,Ca S and the total mass fraction of inclusions increased from 0.003 2% to 0.004 1%.With the Al content increasing from 0.005% to 0.05%,the inclusions of 2CaO·SiO2 changed into CaO·Al2O3,CaO·2Al2O3,while total mass fraction of inclusions unobviously increased from 0.002 8% to about 0.003 3%.In addition,with the O content increasing from 0.000 3% to 0.002 1%,inclusion types changed from Ca S to CaO·Al2O3,CaO·2Al2O3,and the total mass fraction increased from 0.002 4% to 0.005 1%.
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