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| 颗粒增强钛基复合材料等温热变形与组织演化规律 |
| Isothermal Hot Deformation and Microstructural Evolution of Particulate Reinforced Titanium Matrix Composites |
| Received:May 11, 2017 Revised:July 10, 2017 |
| DOI：10.3969/j.issn.1674-6457.2017.04.002 |
| 中文关键词: 钛基复合材料 等温锻造 热加工图 热变形 组织演变 |
| 英文关键词: titanium matrix composites isothermal forging hot processing map hot deformation microstructural evolution |
| 基金项目:国家自然科学基金(51501112，51371114，U1602274)；凝固技术国家重点实验室开放课题（SKLSP201620） |
| Author Name | Affiliation | | LYU Wei-jie | State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China | | HAN Yuan-fei | State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China | | SUN Xiang-long | State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China | | MAO Jian-wei | State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China | | WANG Li-qiang | State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China | | ZHANG Di | State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China |
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| 中文摘要: |
| 目的 突破难变形颗粒增强钛基复合材料热加工关键技术，以满足航空航天、武器装备等领域对轻量化耐高温钛基复合材料的战略需求。方法 采用等温热变形技术研究颗粒增强钛基复合材料(TiB+La2O3/Ti)的热变形行为及微观组织演化规律，在变形温度为850~1100 ℃、应变速率为0.001~1 s-1的条件下，建立该复合材料的本构方程及热加工图，结合微观组织演化规律分析，确定该复合材料等温热变形最佳加工工艺范围。结果 增强体的加入，使钛基复合材料的流变应力和变形激活能提高，缩小了有效加工区间；材料热加工图中存在2个功率耗散率峰值区域，分别位于α+β两相区(900~950 ℃，0.003~0.1 s-1)和β单相区(1075~1100 ℃，0.3~1 s-1)；在两相区易于发生连续动态再结晶，而单相区则对应于β晶粒的“项链”再结晶和片状α相的动态回复。结论 该难变形复合材料等温热变形的最佳工艺范围为温度900~950 ℃、应变速率为0.003~0.1 s-1。 |
| 英文摘要: |
| This study aims to break through the key hot working technology of hard deformed particulate reinforced titanium matrix composites, to meet the strategic demand in aerospace, weapons and other lightweight field of high temperature titanium matrix composites. The isothermal hot deformation technology was adopted to study the hot deformation behaviors and microstructure evolution rules of particulate reinforced titanium matrix composites (TiB+La2O3/Ti). At 850~1100 ℃ of deformation temperature and 0.001~1 s-1 of strain rate, the constitutive equations and processing maps of the composites were established to determine the optimum processing range of the composites in combination with analysis on rules of microstructure evolution. Reinforcements increased the flow stress and deformation activation energy of titanium matrix composites and narrowed the effective processing section. The hot processing maps showed two peak areas of power dissipation rate, respectively located in α+β phase region (900~950 ℃/0.01~0.1 s-1) and β single phase region (1050~1100 ℃/0.1~1 s-1). Continuous dynamic recrystallization occurred in both phase regions. The single phase region was corresponding to “necklace” recrystallization of β grains and dynamic recovery of lamellar α phase. The temperature range and strain rate of optimal process for isothermal hot deformation of difficult-to-deform composites are 900~950 ℃ and 0.003~0.1 s-1 respectively. |
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