| 安苏阳,马凤仓,刘平,刘新宽,李伟,张柯.晶界工程处理对304不锈钢耐蚀性能和力学性能的影响[J].有色金属材料与工程,2021,42(4):19-26. |
| 晶界工程处理对304不锈钢耐蚀性能和力学性能的影响 |
| Effect of Grain Boundary Engineering Treatment on Corrosion Resistance and Mechanical Properties of 304 Stainless Steel |
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| DOI：10.13258/j.cnki.nmme.2021.04.003 |
| 中文关键词: 304不锈钢 晶界工程处理 退火孪晶 耐蚀性能 |
| 英文关键词:304 stainless steel grain boundary engineering treatment annealing twins corrosion resistance |
| 基金项目:国家自然科学基金资助项目（51771119）；上海市自然科学基金资助项目（17ZR1419600） |
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| 中文摘要: |
| 通过扫描电子显微镜、电化学工作站、晶间腐蚀试验及万能材料拉伸试验机研究了晶界工程处理对304不锈钢耐腐蚀性能和力学性能的影响。结果显示，经8%冷轧变形及1 100 ℃退火6 min处理后的304不锈钢，与1 050 ℃固溶处理30 min的304不锈钢相比，低重合位置点阵(coincidence site lattice, ΣCSL) 晶界比例从45.1%增加到77.8%，Σ3晶界比例从42.0%增加到65.5%。并且在迁移的随机晶界上引入了具有低晶界能的特殊晶界片段退火孪晶，降低了大角度晶界网络的连通性，优化了晶界分布，提升了304不锈钢抗晶间腐蚀性能。晶界工程处理对304不锈钢的力学性能影响较小，晶界工程处理后，其抗拉强度和屈服强度小幅度降低，分别降低了20 MPa和13 MPa，伸长率提高了8%。 |
| 英文摘要: |
| The effect of grain boundary engineering (GBE) treatment on the corrosion resistance and mechanical properties of 304 stainless steel was investigated by scan electron microscopy, electrochemical workstation, intergranular corrosion test and universal tensile testing machine. The results show that compared with the 304 stainless steel after solution treatment at 1050 ℃ for 30 min, low ΣCSL (coincidence site lattice) grain boundaries ratio in the 304 stainless steel after rolled with 8% cold rolling reduction and annealed at 1100 ℃ for 6 min increases from 45.1% to 77.8%, and the Σ3 grain boundaries ratio increases from 42.0% to 65.5%. Moreover, annealing twins, a special grain boundary segment with low grain boundary energy, are introduced into the migrated random grain boundary, which reduces the connectivity of large angle grain boundary network, optimizes the grain boundary distribution and improves the intergranular corrosion resistance of 304 stainless steel. The mechanical properties of 304 stainless steel are less affected by grain boundary engineering treatment. After grain boundary engineering treatment, the tensile strength and yield strength slightly decreases by 20 MPa and 13 MPa, respectively, and the elongation increases by 8%. |
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