热冲击条件下Al2O3p/钢基表层复合材料结构优化及热应力场控制

Under thermal shock working condition, it is an important reason that thermal stress acts on ceramic particle reinforced steel substrate surface composite for crack initiating. The character of composite thermal stress field is a critical factor, it has an key influence on the thermal stress action. Al2O3p/steel surface composite is the research object in this project. The stress field control is achieved by design of transitional interface and discontinuous structure composite. The composites with different structure is processed by layered preloading and foam forming method. The thermal stress field model is found by theory of thermology and mechanics, this model is modified by the residual thermal stress test and residual thermal stress model. The connection between composite structure character and thermal stress field character is investigated for controlling the thermal stress field. This research focus on the key issue how to reduce the negative influence of stress concentration in surface composite. The achievement of this project would offer theory support on the application of this composite under the complex working condition with thermal shock and abrasion.

热冲击条件下陶瓷颗粒增强钢基表层复合材料中的热应力作用是诱发热疲劳裂纹形成的重要原因，而复合材料的热应力场特性是影响热应力作用的关键因素。项目以Al2O3p/钢基表层复合材料为研究体系，通过过渡型界面和非连续复合层结构优化设计控制应力场的思路，首先采用分层预压+发泡成型方法实现不同结构及工艺参数表层复合材料的制备，然后利用热学、力学测试分析方法及理论，建立热冲击条件下复合材料的温度场、应力场及其耦合场，获得表层复合材料的热应力场模型，并结合热疲劳残余应力测试及其数学模型的建立，对热应力场模型进行校正，研究结构参数与热应力场间的关联，最终获得热冲击条件下表层复合材料的热应力场控制机制，研究属于陶瓷颗粒增强表层复合材料及具有类似组织结构材料在热冲击条件下的应用中急需解决的关键科学问题。项目的实施将大大拓展该类材料的应用领域，并为其在热冲击复合磨损工况下的成功应用奠定理论基础。

项目以陶瓷颗粒/钢基表层复合材料为研究体系，通过过渡型界面和非连续复合层结构设计控制应力场的思路，首先采用分层预压成型方法实现不同结构及工艺参数表层复合材料的制备，然后利用热学、力学测试分析方法及理论，建立热冲击条件下复合材料的温度场、应力场及其耦合场，获得表层复合材料的热应力场模型，研究结构参数与热应力场间的关联，最终获得热冲击条件下表层复合材料的热应力场控制机制，研究属于陶瓷颗粒增强表层复合材料及具有类似组织结构材料在热冲击条件下的应用中急需解决的关键科学问题。项目的实施将大大拓展该类材料的应用领域，并为其在热冲击复合磨损工况下的成功应用奠定理论基础。