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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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固溶温度对S32760双相不锈钢组织与耐点蚀性能的影响
DOI: 10.11900/0412.1961.2015.00044, PP. 1085-1091
Keywords: 双相不锈钢,固溶处理,析出,耐点蚀性能
Abstract:
利用OM,EPMA,SEM,EDS,TEM等研究了固溶温度对S32760双相不锈钢热轧板显微组织的影响及合金元素的分布特征,并通过电化学工作站测定了材料的耐点蚀性能.结果表明,S32760双相不锈钢在1080℃以上高温固溶过程中,N元素从g相扩散转移至d相中.若固溶后缓慢冷却,则N原子又重新迁移回g相中;如果固溶后水冷,则N原子来不及扩散,于d相中原位弥散析出Cr2N颗粒.Cr2N颗粒的数量由淬火前的固溶温度决定,温度越高数量越多.当固溶温度从1100℃升至1300℃时,d相中N的固溶度快速上升,其显微硬度由281HV提高至345HV;而g相由于相比例降低也使得N的浓度间接上升,显微硬度由290HV升至314HV.同时,由于实验钢中含有W,S32760双相不锈钢热轧板在1040℃以下热处理有s相析出,因此其固溶水冷温度区间较窄,最佳固溶温度为1060℃.此温度保温60min后水冷,试样中无析出物,Brinell硬度为249HBW,点蚀电位为1068mV,维钝电流密度为1.48×10-4A/cm2.
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