|Table of Contents|

Microstructure of selective laser melted nickel-based superalloy K42O2(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2017年01期
Page:
55-59
Research Field:
工艺与材料
Publishing date:

Info

Title:
Microstructure of selective laser melted nickel-based superalloy K42O2
Author(s):
ZUO Wei; ZHANG Quanming; WU Wenjie; ZHOU Huaguang
Xi’an Space Engine Factory, Xi’an 710100, China
Keywords:
selective laser melting; K4202 nickel-based superalloy; microstructure characteristic; evolution law
PACS:
V261-34
DOI:
-
Abstract:
In order to realize the popularization and application of selective laser melting (SLM) innovative process in the liquid rocket superalloy structure,its strengthen mechanism and corresponding heat treatment regime are revealed.The microstructure formation,evolution laws and phase formation characteristics of SLM under rapid solidification condition are discussed and analyzed in this article.The optical micrograph (OM),scanning electron microscopy (SEM),X-ray diffraction (XRD),and ANSYS thermal simulation combining with classic solidification theory were adopted on a K4202 superalloy sample fabricated by SLM to reveal its microstructure characteristics and evolution laws.It was observed that the as-deposited microstructure was out-of-equilibrium,composed of epitaxial elongated columnar crystal paralleling to the deposition direction,but at the top of the SLM sample the dendrites grew along the laser scanning direction and appeared as secondary dendrite arm,and the precipitated phases were inhibited.

References:

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Last Update: 1900-01-01