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对含有不同C/Nb比率经750℃时效的20Cr-25Ni系奥氏体不锈钢,用显微分析电子显微镜(AEI EMMA4仪)测定晶间碳化物M_(23)C_6颗粒的含Nb量与时效时间的关系。发现在一定的合金内M_(23)C_6中含Nb量随着颗粒尺寸增大和(或)时效时间的增加而增加。对一定尺寸的碳化物而言,发现合金C/Nb比率越高,时效时间越长,碳化物中含Nb量增长就越快。当考察了合金的全部沉淀行为后,这些结果就可以被理解了。
For 20Cr-25Ni austenitic stainless steels aged at 750 ℃ with different C / Nb ratios, the content of Nb in intergranular carbide M_ (23) C_6 particles and the aging time were measured with a microanalytical electron microscope (AEI EMMA4) Relationship. It is found that the amount of Nb in M_ (23) C_6 in a given alloy increases with increasing grain size and / or aging time. For a certain size of carbide, it was found that the higher the alloy C / Nb ratio, the longer the aging time, the faster the Nb content in the carbide grows. These results can be understood when examining the overall precipitation behavior of the alloy.