Microstructural Characteristics of Freckles in Ni-based Single Crystal Superalloys

doi:10.12442/j.issn.1002-185X.20210889

Home > Archive>Volume 51, Issue 10, 2022 >3533-3541. DOI:10.12442/j.issn.1002-185X.20210889

Microstructural Characteristics of Freckles in Ni-based Single Crystal Superalloys
DOI:
                        10.12442/j.issn.1002-185X.20210889
                    
Author:
                        Wang ZhichengWang Zhicheng
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
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Li JiarongLi Jiarong
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
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Liu ShizhongLiu Shizhong
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
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Yang WanpengYang Wanpeng
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
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Affiliation:Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
Clc Number:TG132. 3
Fund Project:National Science and Technology Major Project (2017-VⅠ-0001-0070)

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Abstract:

The as-cast microstructure, the heat-treated microstructure and the composition characteristics of freckle chains in the third generation single crystal superalloy DD9 were studied by OM, SEM, EBSD and TEM. The results show that freckles are composed of fine disorder-oriented equiaxed grains. They are in the shape of a chain roughly along the direction of crystal growth and only appear on the surface of single crystal castings. The depth and width of freckle chains are 400~800 μm. Freckled area contains a large amount of γ/γ' eutectics. A certain amount of MC carbides and porosity also appear in as-cast freckled area. After heat treatment, large-size γ' phase and granular M₆C phase appear at the equiaxed grain boundary of freckled region. The freckled area contains more Ta and Al, but less Re and W. The composition of the freckled area is similar to the interdendritic composition.

Key words:single crystal superalloy;DD9;freckles;element segregation

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[Wang Zhicheng, Li Jiarong, Liu Shizhong, Yang Wanpeng. Microstructural Characteristics of Freckles in Ni-based Single Crystal Superalloys[J]. Rare Metal Materials and Engineering,2022,51(10):3533~3541.]
DOI：10.12442/j. issn.1002-185X.20210889

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Received:October 13,2021
Revised:January 26,2022
Adopted:February 09,2022
Online: October 31,2022
Published: October 28,2022

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