DYNAMIC MATERIAL MODEL THEORY AND ITS APPLICATION FOR CONTROLLING MICROSTRUCTURES

AND PROPERTIES OF HOT WORKED MATERIALS

LU Shiqiang¹  LI Xin¹  WANG Kelu¹  DONG Xianjuan¹  LI Zhenxi²  CAO Chunxiao²

(1. School of Material Science and Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330063;
2. Beijing Institute of Aeronautical Materials, Beijing 100095)

Abstract: Dynamic material model (DMM) and its processing map technology are a theoretical approach, by which materials hot working processes can be optimized with the aim of controlling the microstructures and properties of hot worked materials and improving quality and reliability of product. The theoretical basis and development of DMM and processing map technology are here reviewed, and the basis and principle of both irreversible thermodynamics and dissipative structure related to the criteria for the occurrence of flow stabilities and/or instabilities as well as the criteria’s deduction processes are introduced. The advantage and disadvantage, including available situations, of various stability and instability criteria based on DMM are theoretically compared and analyzed, and some issues, which should be noted in applying the criteria to realize controlling of microstructure and properties of hot worked materials, are pointed out. A few examples of applying DMM and map technology to resolve hot working problem in practice, in order to controll materials microstructures and properties, guarantee product quality, and improve productivity, are briefly presented.

Key words: Dynamic material model Processing map Irreversible thermodynamics Dissipative structure Criteria of flow stabilities and/or instabilities Controlling of microstructures and properties of hot worked materials

CLC No: TG316 TG312 O344.4 TU313.2

Received 20060904, received in revised form 20070412