大型铸钢基体锻模型腔双金属梯度连接机理及性能研究

项目名称： 大型铸钢基体锻模型腔双金属梯度连接机理及性能研究

项目编号： No.51275543

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 周杰

作者单位： 重庆大学

项目金额： 80万元

中文摘要： 为解决大型模锻液压机（8万吨压机）锻模采用传统制造方法时遇到的模块自由锻难度大、锻透性差、热处理硬度低达不到要求、易出现热处理裂纹、制造成本高等问题，首次提出利用特种铸钢材料作为锻模基体，在模具型腔工作区域采用双金属性能梯度层连接（过渡层和强化层）方法来制造大型锻模的方法。通过研究过渡层连接材料与铸钢基体材料成分之间相互扩散和融合的机理，研究融合区沿层厚度方向组织和机械性能的差异化梯度，研究各梯度层连接材料成份、连接厚度等因数对连接区域组织和性能的影响规律，研究高温高压下融合区及铸钢基体区域应力场分布与承压能力，锻模试生产后连接区域组织、性能和型腔尺寸变化规律等，建立连接层厚度合理匹配模型，连接区性能梯度差异化数学模型，获得双金属梯度连接各层材料厚度的合理范围及材料成分。最终得以指导大型铸钢基体型腔结构及连接结构设计、连接工艺及方法设计，试验及生产规程。

中文关键词： 双金属梯度层；大型锻模；铸钢；连接机理；力学性能

英文摘要： With traditional forging die manufacturing method, the open die forging and forging permeability of large hydraulic press(800MN) forging die is difficult, the hardness is low and the cracks appear easily after heat treatments and the cost is quite high. To solve these key challenges of large forging die designing and manufacturing, the gradient manufacturing method is firstly proposed, which takes special cast steel as the forging die base and a dual metal gradient layer (DMGL, the transition layer and strengthening layer) welded on the working area of the die cavity. The investigation focuses on the following main aspects, firstly the diffusion and the fusion mechanism between the transition layer material and the cast steel substrate material; secondly the differentiated gradient of organization and mechanical properties in fusion area along the layer thickness direction; thirdly the influence of material composition and thickness of the gradient layer on the connection regional organization and performance; fourth the stress field distribution and pressure-bearing in cast steel substrate fusion area, under high temperature and high pressure; and lastly the rule which organization and performance in connection regional and cavity size change after the trial production. After the investigation it is possible t

英文关键词： dual metal gradient layer；large forging die；cast steel；connecting mechanism；mechanical properties