Integrative material and process model for the correlation of phase morphology and flow behavior of spheroidization annealed low-alloyed carbon steels

球化退火低合金碳钢相形态与流动行为相关的综合材料和工艺模型

• 批准号: 433641220
• 负责人: Professor Dr.-Ing. Rudolf Kawalla
• 金额: --
• 依托单位: MPA Stuttgart, Otto-Graf-Institut (FMPA)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/433641220?language=en
• 关键词: Integrative; material; process; model; correlation

The mechanical properties of multiphase steel materials such as strength, toughness and ductility do not depend solely on their chemical composition and the volume fraction of phase constituents. Rather, the microstructure morphology used in the course of semi-finished product manufacture and heat treatment, e.g. of spheroidization annealing, has a pronounced influence. For example, the influence of cementite morphology on the mechanical properties of spheroidizing annealed steels has already been demonstrated by various investigations. However, the current state of research lacks a fundamental understanding of the integrative relationship between heat treatment conditions and the resulting flow properties and deformation behaviour of a steel material via the morphology change of its microstructure. The solution to this problem is devoted to this project, in which the complex interactions are determined experimentally and building on that, a numerical model will be created. Various experimental techniques from the field of purely thermal and external stress assisted heat treatment, SEM-in situ-, -2D- and -3D-metallography, the determination of individual phase properties as well as multiaxial bulk forming represent the experimental approach. The numerical model should comprise several simulative tools such as the phase field theory for temporal and spatial development of phases, representative volume elements for determining the final properties of the material and artificial neural networks for transferring the results obtained to other materials. To validate the model, experimental investigations of the practical characterization of formability are required. The results from modelling should contribute to an improved understanding of the relationships between strength properties and deformation behaviour, microstructure development and soft annealing parameters. A practice-relevant advantage opens up by the possibility of being able to control the required flow properties inversely via the established relationships in a targeted manner in accordance with the respective downstream forming process, to save unnecessary hours of annealing and to ensure the interchangeability of steel materials.

多相钢材料（例如强度，韧性和延展性）的机械性能不仅取决于它们的化学成分和相量成分的体积分数。相反，在半生产产品生产和热处理过程中使用的微观结构形态，例如球体化退火具有明显的影响。例如，各种研究已经证明了牙龈形态对球体化退火钢的机械性能的影响。但是，目前的研究状态缺乏对热处理条件与所得的流量特性和钢材材料的变形行为之间的综合关系的基本了解，这是通过其微观结构的形态变化。解决此问题的解决方案是专门针对该项目的，在该项目中，将通过实验确定复杂的交互作用，并在此基础上创建一个数值模型。来自纯热和外部应力辅助热处理领域的各种实验技术，SEM-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-ENICERIGHT，-3d-Metalloghich，单个相性能的测定以及多轴体积形成代表实验方法。数值模型应包含几种模拟工具，例如用于相位的时间和空间发展的相位场理论，即确定材料的最终特性和人工神经网络的代表性体积元素，以转移获得其他材料的结果。为了验证该模型，需要对实现性表征的实验研究。建模的结果应有助于改善对强度性能与变形行为，微结构发展和软退火参数之间关系的理解。与练习相关的优势可以通过根据各自的下游形成过程以有针对性的方式来反向控制所需的流量性能，以节省不必要的退火时间并确保钢材材料的互换性。