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| D406A钢高温氧化行为及其微观组织演变规律 |
| Microstructure Evolution and Oxidation Behavior of D406A Ultrahigh-strength Steel during High Temperature Processing |
| Received:May 11, 2019 Revised:July 10, 2019 |
| DOI：10.3969/j.issn.1674-6457.2019.04.015 |
| 中文关键词: D406A钢 氧化 组织演变 魏氏组织 |
| 英文关键词: D406A steel oxidation microstructure evolution widmanstatten structure |
| 基金项目:国家自然科学基金（51775440）；中央高校基础科研业务费（3102018ZY005） |
| Author Name | Affiliation | | YANG Hao | 1. School of Materials, Northwestern Polytechnical University, Xi′an 710072, China | | YANG Jing-yun | 2. Deyang Wanhang Die Forging Co., Ltd., China National Erzhong Group Co., Deyang 618013, China | | NING Yong-quan | 1. School of Materials, Northwestern Polytechnical University, Xi′an 710072, China |
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| 中文摘要: |
| 目的 改善D406A超高强度钢在锻造过程中氧化行为和组织粗化的问题。方法 研究不同温度和保温时间下D406A钢的尺寸变化、质量损失率和氧化速率，通过金相显微镜观察其组织的变化。结果 D406A钢在1110 ℃及以下温度加热时，试样的尺寸与质量损失率与保温时间基本呈线性关系；D406A钢的氧化速率在60 min内不断降低，60 min后随保温时间趋于平稳；加热温度在1110 ℃以下，保温时间60 min以内时，试样可以获得较为细小的奥氏体晶粒。结论 根据实验结果，确定了D406A钢加热时氧化速率和保温时间的关系，同时总结了其组织演变规律，为实际生产过程提供了理论依据。 |
| 英文摘要: |
| The paper aims to improve the problem of oxidation and coarse microstructure of D406A in forging process. The experiment analyzed the dimension change rate, weight change rate and oxidation rate of D406A ultrahigh-strength steel at different temperatures and different holding times. And the experiment also observed the microstructure evolution with a metallographic microscope. The result showed that: When D406A steel was heated at 1110 ℃ and below, the dimensional change and mass change rate of the specimen and the holding time were basically linear. The oxidation rate of D406A steel was continuously reduced within 60 min, and it tended to be stable when the holding time was more than 60 min. When the heating temperature was below 1110 ℃ and the holding time was less than 60 min, the specimen could obtain fine austenite grains. According to the experimental results, the relationship between oxidation rate and holding time of D406A steel is established, and its microstructure evolution law is summarized, providing a theoretical basis for the actual production process. |
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