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| 2209双相不锈钢本构模型及热加工参数优化 |
| Constitutive Model and Hot Working Parameters Optimization of 2209 Duplex Stainless Steel |
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| DOI：10.3969/j.issn.1674-6457.2022.08.007 |
| 中文关键词: 2209双相不锈钢 本构模型 热加工图 微观组织 |
| 英文关键词: 2209 duplex stainless steel constitutive model thermal processing diagram microstructure |
| 基金项目:山西省重点研发计划(201903D121043);山西省先进钢铁材料重点科技创新平台建设项目(20201041);常州市领军型创新人才引进培育项目(CQ20200042);山西省研究生教育改革研究课题(2020YJJG241) |
| Author Name | Affiliation | | LI Liang | Engineering Research Center of Ministry of Heavy Machinery, Taiyuan University of Science and Technology, Taiyuan 030024, China | | SHUAI Mei-rong | Engineering Research Center of Ministry of Heavy Machinery, Taiyuan University of Science and Technology, Taiyuan 030024, China | | LI Hai-bin | Engineering Research Center of Ministry of Heavy Machinery, Taiyuan University of Science and Technology, Taiyuan 030024, China | | WANG Jian-mei | Engineering Research Center of Ministry of Heavy Machinery, Taiyuan University of Science and Technology, Taiyuan 030024, China | | ZHANG Min | Engineering Research Center of Ministry of Heavy Machinery, Taiyuan University of Science and Technology, Taiyuan 030024, China | | WANG Jin-hui | Shanxi Taigang Stainless Steel Co., Ltd., Baowu Group, Taiyuan 030003, China |
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| 中文摘要: |
| 目的 优化2209双相不锈钢热加工区间，提升其高温变形稳定性。方法 在Gleeble–3800热模拟机上开展压缩实验，分析不同温度(950~1 150 ℃)和应变速率(0.01~10 s−1)下的应力–应变曲线特征，构建基于Arrhenius的双曲正弦本构模型，综合分析热加工图和变形微观组织演变特征。结果 流变应力随变形温度的降低和应变速率的增大而增大;在失稳条件下(950 ℃/0.01 s−1)，奥氏体相所受应变能较小，只有一部分奥氏体晶粒发生了变形;温度升高(1 100 ℃/0.01 s−1)后，奥氏体相仍为等轴状晶粒，铁素体相承担塑性变形，此时表现为明显的应变分布不均匀现象;随着应变速率升高到稳定条件(1 100 ℃/1 s−1)，奥氏体相承受了更大的塑性变形，且在压缩方向应力的作用下呈现条带状分布，同时发生了γ→δ的转变，这有利于提高钢的热塑性。结论 获得了2209双相不锈钢最佳加工区域(1 070~1 130 ℃、1~7 s−1)，该区域功率耗散系数较大且变化梯度较小，材料热加工性能稳定。 |
| 英文摘要: |
| The work aims to optimize the hot working range of 2209 duplex stainless steel and improve its high-temperature deformation stability. The stress-strain curves at different temperatures (950-1 150 ℃) and strain rates (0.01-10 s−1) were analyzed on Gleeble-3800 thermal simulator. A hyperbolic constitutive model was established based on Arrhenius. Comprehensively, the thermal processing map and microstructure evolution characteristics were both analyzed. The results showed that the flow stress increased with decrease of deformation temperature and the increase of strain rate. In the unstable region (950 ℃/0.01 s−1), the strain energy of the austenite phase was small, and only part of austenite grains deformed. With the increase of temperature (1 100 ℃/0.01 s−1), the austenite phase was still equiaxed grains and the ferrite phase bore plastic deformation, which showed obvious uneven strain distribution. However, with the increase of strain rate in the stable region (1 100 ℃/1 s −1), the austenite phase withstood greater plastic deformation, and distributed in band under the action of compressive stress, and the transformation of γ→δ occured, which was conducive to improving the thermoplasticity of steel. The optimal processing region (1 070- 1 130 ℃, 1-7 s−1) of 2209 duplex stainless steel is obtained, in which the power dissipation coefficient is large and the variation gradient is small, and the thermal processing performance of material is stable. |
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