公开(公告)号：US20140332175A1

公开(公告)日：2014-11-13

申请号：US13889534

申请日：2013-05-08

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Shan LIU ,  Warren Tan KING ,  Srinivasan RAGHAVAN ,  Arthur S. PECK ,  Dayananda NARAYANA

IPC: C30B11/00 ,  C30B35/00

CPC classification number: C30B11/00 ,  B22C7/02 ,  B22C9/065 ,  B22C13/08 ,  B22C13/085 ,  B22D15/04 ,  B22D27/04 ,  C30B11/006 ,  C30B11/14 ,  C30B29/52 ,  C30B35/00

Abstract: A grain starter for use in solidification of molten metallic material forming an article having a directional grain structure and a method for solidifying an article having a directional grain structure with a substantial absence of stray grains. The grain starter comprises a grain-starting material that initiates grain growth in the molten metallic material in a preselected crystallographic direction. The grain-starting material has a melting temperature higher than the metallic material forming the article lest the grain starter be modified by contact with the molten material. The grain starter further includes a feature that modifies heat transfer characteristics of the metallic material in contact with it in order to produce an article having grains oriented in the preselected crystallographic orientation and modifies the profile of the advancing solidification front. The article is substantially free of stray grains not oriented in the preselected crystallographic direction.

Abstract translation: 用于固化形成具有定向晶粒结构的制品的熔融金属材料的晶粒启动器和具有基本上没有杂散晶粒的具有定向晶粒结构的制品的固化方法。 谷物起动器包括在预选的晶体方向上引发熔融金属材料中的晶粒生长的晶粒起始材料。 晶粒起始材料的熔融温度高于形成制品的金属材料，以免通过与熔融材料接触来改变谷物起动机。 晶粒起动器还包括改变与其接触的金属材料的传热特性的特征，以便产生具有以预选结晶取向定向的晶粒的物品，并改变前进固化前沿的轮廓。 该制品基本上没有未在预选晶体方向取向的杂散颗粒。