| 引用本文: | 乔士宾,何西扣,刘正东.SA508Gr.4N钢奥氏体晶粒长大行为研究[J].材料科学与工艺,2021,29(4):8-15.DOI:10.11951/j.issn.1005-0299.20200222. |
| QIAO Shibin,HE Xikou,LIU Zhengdong.Study on austenite grain growth behavior of SA508Gr.4N steel[J].Materials Science and Technology,2021,29(4):8-15.DOI:10.11951/j.issn.1005-0299.20200222. |
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| 摘要: |
| 为研究保温温度和保温时间对SA508Gr.4N钢奥氏体晶粒长大行为的影响,利用光学显微镜和高温激光共聚焦显微镜研究了该钢在保温温度为900~1 200 ℃,保温时间0~600 min条件下的晶粒长大行为。研究表明,随着保温温度的升高和保温时间的增加,奥氏体晶粒尺寸逐渐增加；在900~1 000 ℃,由于部分AlN逐渐回溶,抑制晶粒长大的作用减弱,但相比AlN完全回溶的情况,部分晶粒长大速度相对缓慢,导致混晶现象。随着温度的进一步提高,AlN全部溶解,使得晶粒迅速长大,且晶粒较为均匀；晶界迁移是SA508Gr.4N钢奥氏体晶粒长大的主要机理。基于本文实验数据,采用Sellar-Anelli模型建立了SA508Gr.4N钢晶粒长大模型,通过实测值和预测值对比可以得出晶粒长大模型的决定系数(R2)和对称平均绝对百分比误差(SMAPE)分别为0.99和6.75%。 |
| 关键词: 核电压力容器 SA508Gr.4N钢 奥氏体晶粒 晶粒长大模型 晶界迁移 |
| DOI：10.11951/j.issn.1005-0299.20200222 |
| 分类号:TG142 |
| 文献标识码:A |
| 基金项目:国家科技重大专项项目(2010ZX06004-016)；中国核工程材料自主保供战略研究项目(2020-XY-08). |
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| Study on austenite grain growth behavior of SA508Gr.4N steel |
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QIAO Shibin,HE Xikou,LIU Zhengdong
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(Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China)
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| Abstract: |
| In order to study the effect of holding temperature and holding time on austenite grain growth behavior of SA508Gr.4N steel, the grain growth behavior of SA508Gr.4N steel was studied by optical microscope and high temperature laser confocal microscope at 900~1 200 ℃ for 0～600 min.The results showed that the grain size of austenite grew up with increasing temperature and the holding time. In the temperature range of 900~1 000 ℃,the effect of inhibiting grain growth was weakened due to the gradual dissolution of part of AlN.However, compared with the situation with complete AlN dissolution, the growth rate of some grains was relatively slow, leading to mixed grain phenomenon. With the further increase of temperature, AlN dissolved completely, which made the grains grow rapidly and more uniform. Grain boundary migration acted as the main mechanism of austenite grain growth in SA508Gr.4N steel. Based on the experimental data, the grain growth model of SA508Gr.4N steel was established by Sellar-Anelli model. By comparing the measured value with the predicted value, it was found that determination coefficient (R2) and symmetric mean absolute percentage error (SMAPE) of the grain growth model were 0.99 and 6.75%, respectively. |
| Key words: Nucler pressure SA508Gr.4N steel austenitic grain grain growth model grain boundary migration |
