EFFECTS OF WELDING THERMAL CYCLE AND AGING TREATMENT ON THE MICROSTRUCTURE AND MECHANICAL PROPERTY OF A Ni-Fe BASE SUPERALLOY

doi:10.3724/SP.J.1037.2013.00355

Acta Metall Sin

2014, Vol. 50

Issue (3): 313-322 DOI: 10.3724/SP.J.1037.2013.00355

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EFFECTS OF WELDING THERMAL CYCLE AND AGING TREATMENT ON THE MICROSTRUCTURE AND MECHANICAL PROPERTY OF A Ni-Fe BASE SUPERALLOY

WU Dong¹, WANG Xin^1,², DONG Wenchao¹, LU Shanping¹(

)

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2 China Academy of Engineering Physics, Mianyang 621900

Cite this article:

WU Dong, WANG Xin, DONG Wenchao, LU Shanping. EFFECTS OF WELDING THERMAL CYCLE AND AGING TREATMENT ON THE MICROSTRUCTURE AND MECHANICAL PROPERTY OF A Ni-Fe BASE SUPERALLOY. Acta Metall Sin, 2014, 50(3): 313-322.

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Abstract

Increasing the steam temperature and pressure of boilers in super-ultracritical power plant is an important approach to increase the plant efficiency. The steam temperature of the most efficient coal power plant is now around 620 ℃, representing an increase of about 80 ℃ in the past 40 years, which owes to the high temperature properties improvement of boiler components, such as the superheater and the reheater. Nickel base superalloy, for example Inconel 740 and Inconel 617, is being developed by some countries for the material requirement of 700 ℃ super-ultracritical power plants. Meanwhile, weldability investigation is necessary for the developing materials since welding plays a key role on the construction of coal power plant boilers. In this work, the weldability of a kind of Ni-Fe base superalloy, one of the candidate materials for the high temperature components of 700 ℃ ultra-supercritical coal plant is studied. By welding thermal simulator (Gleeble 1500) experiments, the variation and evolution of mechanical properties and microstructure were analyzed for this Ni-Fe base superalloy, under welding thermal cycle treatment condition and aging treatment condition after welding thermal cycle. After the welding thermal cycle with a peak temperature of 1249 ℃, both the yield strength and tensile strength for solutioned Ni-Fe base superalloy at 25 and 700 ℃ were decreased, along with the increasing of ductility. After aging treatment to the Ni-Fe base superalloy experienced a welding thermal cycle, the yield strength and tensile strength at 25 ℃ were similar with those of the aged base metal. At 700 ℃, the strength of the heat affected zone (HAZ) after aging treatment is higher than that of the aged Ni-Fe base superalloy. Microstructure analysis showed that the γ' phase and MC carbide in Ni-Fe base superalloy dissolved during the high temperature welding thermal simulation experimental process. The solution of carbides in the grain boundaries caused a loss of a pinning effect on the migration of grain boundary and a decreasing of the strength. After the aging treatment to the Ni-Fe base superalloy experienced a high temperature welding thermal cycle, γ' and M₂₃C₆ carbide were precipitated. The precipitation of M₂₃C₆ at the grain boundaries during aging treatment was mainly due to the supply of the carbon from the MC which had been dissolved partially during former welding thermal cycle.

Key words: Ni-Fe base superalloy welding thermal cycle aging γ' carbide mechanical property

Received: 26 June 2013

ZTFLH:

TG113.26

Fund: Supported by High Technology Research and Development Program of China (No.2012AA03A501)

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	Dong WU
	Xin WANG
	Wenchao DONG
	Shanping LU

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00355 OR https://www.ams.org.cn/EN/Y2014/V50/I3/313

Fig.1

焊接过程中热电偶测温位置(A, B和C点)几何示意图

Fig.2

测温点实测焊接热循环曲线与模拟焊接热循环曲线对比

Fig.3

模拟和实际焊缝的横截面形貌对比

Fig.4

沿焊缝横截面硬度分布(硬度测量位置沿图3a焊缝形貌中的白色示意线)

Fig.5

焊接模型中S'点处的焊接热循环曲线

Fig.6

焊接热循环前后试样的形貌对比

Fig.7

Ni-Fe基高温合金固溶态和焊接热循环态下的碳化物和碳氮化物形貌的SEM像

Fig.8

Ni-Fe基高温合金固溶态和焊接热循环态下的γ'相形貌的SEM像

Fig.9

Ni-Fe基高温合金固溶态和焊接热循环态下的晶粒形貌

Table 1 Grain size distribution of Ni-Fe superalloy at solution state and welding thermal cycle state

Table 2 Tensile properties of Ni-Fe base superalloy at 25 and 700 ℃

Fig.10

固溶态和焊接热循环态拉伸断裂试样

Fig.11

焊接热循环区中心A点至固溶区母材B点的硬度分布

Fig.12

Ni-Fe基高温合金母材和HAZ试样在25和700 ℃下的拉伸断口形貌

Fig.13

Ni-Fe基高温合金HAZ时效后和母材时效后晶界析出相形貌

Fig.14

Ni-Fe基高温合金焊接热循环区时效后和母材时效后的γ'相形貌

Table 3 Tensile properties of Ni-Fe base superalloy (containing HAZ) after aging treatment at 25 and 700 ℃

Fig.15

焊接热循环后时效试样的高低温拉伸断口形貌

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