Heat shock behavior of permanent die during non-solid near-net forming process

摘要：

Heat shocks caused by alloy melt and coat spraying are the main reason of die plastic deformation and early fracture. Based on theoretical analysis of heat shock phenomenon, two characteristic parameters of die damage caused by heat shock were proposed, which are heat shock plastic deformation index (HSPI) and heat shock crack index (HSCI). The effect of heat shock on die plastic deformation and fracture behaviors was described quantitatively by these two parameters. HSPI represents approaching of heat shock stress to die yield stress. Plastic deformation will happen on a die if this index reaches 1.HSCI represents approaching of heat shock stress to die tensile strength. Die fracture will happen if this index reaches 1.According to theoretical analysis of heat transfer, theoretical models of HSPI and HSCI were established. It is found that, the smaller the interfacial thermal resistance (ITR) is, the higher the pouring temperature and die temperature are before heat shock, and the greater the HSPI and HSCI are, which can be fitted as exponential curves, linear and cubic curves.

关键词： non-solid near-net forming die heat shock heat shock plastic deformation indez heat shock crack indez

作者: ZHANG Mi-lan SHAN Zhong-de XING Shu-ming JIANG Chao XU Ying

作者单位: State Key Laboratory of Advanced Forming Technology and Equipment, Advanced Manufacture Technology C State Key Laboratory of Advanced Forming Technology and Equipment, Advanced Manufacture Technology C School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 10004 State Key Laboratory of Advanced Forming Technology and Equipment,Advanced Manufacture Technology Ce

会议类型: 国际会议

会议名称: 2009 Frontier Symposium of China Postductors on Materrials Science(2009年中国博士后材料科学前言论坛)

会议地点: 长沙

会议语种:英文

页码: 795-801

在线出版日期: 2009-11-22（万方平台首次上网日期，不代表论文的发表时间）