激光增材制造钛合金冶金组织特征及其调控方法研究进展  

Research Progress of Metallurgical Structure Characteristics and Control Methods of Laser Additive Manufacturing Titanium Alloys

作　　者：郭艳华[1] 戴国庆 孙中刚 陈小龙[1] 常辉[1] Guo Yanhua;Dai Guoqing;Sun Zhonggang;Chen Xiaolong;Chang Hui(College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京211816

出　　处：《稀有金属材料与工程》2022年第12期4733-4744,共12页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51875274)。

摘　　要：增材制造技术是近年来迅速发展起来的一种快速成型技术,由于其具有制造周期短、成本低、可制造复杂零件等诸多优点而被广泛应用。本文介绍了增材制造的分类以及特殊的超常冶金过程,综述了增材制造下钛合金的冶金组织特征。目前,增材制造过程导致钛合金冶金组织存在显著粗大的柱状晶,且随着制造方法的改变,柱状晶尺寸发生变化;组织分布不均匀,包括相分布和晶粒尺寸分布不均性等。围绕上述问题系统阐述了改善冶金组织的方法,主要包括改变工艺参数,外场辅助,如磁场、超声场,在线轧制塑性变形,添加形核剂等来细化晶粒等,这将为未来增材制造组织改善提供借鉴。Additive manufacturing technology is a rapid prototyping technology that has developed rapidly in recent years. It is widely used due to its many advantages, such as short manufacturing cycle, low cost, and the ability to manufacture complex parts. This article introduced the classification of additive manufacturing and the characteristics of the metallurgical structure. The special super-normal metallurgical process of the additive manufacturing process leads to the existence:(1) significant coarse columnar crystals in the metallurgical structure of titanium alloys, and with the change of manufacturing methods, the size change of the columnar crystals occurs;(2) there is an uneven distribution of the structure, including the uneven distribution of phase and grain size. Focusing on the metallurgical structure of additive manufacturing, the method to improve the metallurgical structure was systematically explained, including changing process parameters, external field assistance, such as magnetic field, ultrasonic field, online rolling plastic deformation, adding nucleating agent to refine grains, etc. The systematic elaboration of the thesis will provide a reference for the improvement of additive manufacturing organization in the future.

关 键 词：增材制造 冶金组织 晶粒细化 

分 类 号：TG146.23[一般工业技术—材料科学与工程]