NUCLEATION AND COARSENING MECHANISM OF δ PHASE IN INCONEL 625 DEPOSITED METAL

doi:10.3724/SP.J.1037.2013.00383

Acta Metall Sin

2014, Vol. 50

Issue (3): 323-328 DOI: 10.3724/SP.J.1037.2013.00383

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NUCLEATION AND COARSENING MECHANISM OF δ PHASE IN INCONEL 625 DEPOSITED METAL

DI Xinjie^1,²(

), XING Xixue^1,², WANG Baosen³

1 Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072
2 School of Materials Science and Engineering, Tianjin University, Tianjin 300072
3 Baosteel Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900

Cite this article:

DI Xinjie, XING Xixue, WANG Baosen. NUCLEATION AND COARSENING MECHANISM OF δ PHASE IN INCONEL 625 DEPOSITED METAL. Acta Metall Sin, 2014, 50(3): 323-328.

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Abstract

Using Inconel 625 wire to weld high yield strength steels or stainless steels that commonly used in nuclear power plant components and gas turbines can significantly improve high temperature mechanical properties and corrosion resistance of weld structure. However, toughness, fatigue strength and creep rupture strength of weld would decline obviously because of the precipitation of δ phase during service at elevated temperatures for a long time. This work aims to investigate nucleation mechanism of δ phase in Inconel 625 deposited metal by means of SEM and TEM. Meanwhile, coarsening inherent law of δ phase during post-weld heat treatment (PWHT) at 850 ℃ for 2, 4 and 8 h respectively was revealed. The results indicate that a large number of needle-like δ phase precipitates in Inconel 625 deposited metal after PWHT at 850 ℃. These δ phases appear a grid-like distribution in γ-matrix, and there are some poor γ" phase regions appearing near δ phase. Formation process of δ phase is a solid phase transformation process which is like bainite transformation in steels. Crystal nucleus of δ phase form in the close-packed plane of γ" phase by shear mode, and coarsening behavior of δ phase is a diffusion-controlled growth process. When PWHT holding time is shorter, actual average size of δ phase is in line with LSW theory. With PWHT holding time extending, its actual average size deviates from the predicted value of classical LSW theory, because of the high-density and non-directional precipitation characteristics of δ phase.

Key words: Inconel 625 deposited metal post-weld heat treatment δ phase nucleation coarsening

Received: 08 July 2013

ZTFLH:

TG401

Fund: Supported by Tianjin Natural Science Foundation (No.11JCYBJC06000) and Key Project of Tianjin Municipal Science and Technology Support Program (No.11ZCGYSF00100)

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	Xinjie DI
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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00383 OR https://www.ams.org.cn/EN/Y2014/V50/I3/323

Fig.1

堆焊试件示意图

Fig.2

Inconel 625熔敷金属组织的SEM像

Fig.3

Inconel 625熔敷金属中δ相的TEM像、 SAED谱及EDS

Fig.4

Inconel 625熔敷金属中δ相的形成过程及其SAED谱

Fig.5

Inconel 625熔敷金属在850 ℃保温不同时间后δ相的TEM像

Holding time / h	$l -$ / nm	$w -$ / nm
2	913	57
4	1423	84
8	1894	136

Table 1 The average sizes of δ phase at different holding times

Fig.6

在850 ℃下δ相的平均尺寸与热处理保温时间的关系

Fig.7

在850 ℃下焊后热处理保温时间对δ相K值的影响

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