Effects of Laves Phase on Burst Behavior of GH3625 Superalloy Pipe During Hot Extrusion
Received date: 2020-07-17
Revised date: 2020-12-17
Online published: 2021-01-20
Supported by
National Key Research and Development Program of China(2017YFA0700703);National Natural Science Foundation of China(51661019);Program for Major Projects of Science and Technology in Gansu Province(145RTSA004);Program for State Key Laboratory Nickel and Cobalt Resources Comprehensive Utilization(301170503);Program for Hongliu First-Class Discipline Construction Plan of Lanzhou University of Technology
GH3625 superalloy is a type of solid-solution strengthened nickel-based wrought superalloy having Mo and Nb as the main strengthening elements. Because of its excellent high-temperature mechanical properties and oxidation resistance below 650 oC, it can be used in harsh stress and atmosphere environments. It is mainly used as a pipe material for aeroengine fuel main pipe, nuclear power steam generator heat transfer pipe, and pressure pipe, etc. Owing to the high alloying degree of nickel-based superalloys, large deformation resistance, and narrow thermal processing temperature range, the pipe preparation process is complicated. In this study, the as-cast and homogenized pipe billets were used for a short-flow hot extrusion pipe preparation test using the same process. The homogenized pipe billet was extruded successfully, and the pipe burst occurred during the extrusion of the as-cast billet. The pipe burst behavior was studied by OM, SEM, and EBSD, with an EDS analysis. The results showed a considerable amount of Laves phases in the as-cast pipe billet, and the Laves phases and micro-segregation were essentially eliminated after homogenization. Adiabatic heating of the as-cast pipe billet leads to the Laves phase remelting during the hot extrusion process, which is the main reason for pipe bursting during a hot extrusion process. The cracking mode of the pipe burst is a quasi-cleavage fracture, combining brittle fracture and ductile fracture with the predominance of the brittle fracture.
Key words： GH3625 superalloy; hot extruded pipe; microstructure; Laves phase; pipe burst
Jianjun CHEN , Yutian DING , Kun WANG , Kang YAN , Yuanjun MA , Xingmao WANG , Shengming ZHOU . Effects of Laves Phase on Burst Behavior of GH3625 Superalloy Pipe During Hot Extrusion[J]. Acta Metall Sin, 2021 , 57(5) : 641 -650 . DOI: 10.11900/0412.1961.2020.00264
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