Processing method for cracking desensitisation using a nickel based alloy environment, mainly for a nuclear reactor fuel assembly and for a nuclear reactor, and part made of the alloy thus processed

一种热处理方法、镍基合金的技术，应用在结构部件的合金领域，能够解决昂贵、失败等问题

Active Publication Date: 2009-12-09
FRAMATOME ANP
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Problems solved by technology

This approach is expensive to develop anyway and often leads to failure

Method used

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Embodiment Construction

[0038] It will be understood that the invention is firstly based on the development of heat treatment of materials carried out in a hydrogen atmosphere or an atmosphere containing hydrogen, in the latter case usually a strong reducing agent is present. This treatment results in a permanent desensitization to environmentally assisted cracking of the alloy, the mechanism of which is explained below.

[0039] This desensitization treatment is not a substitute for, but can be carried out additionally on the basis of, the possible heat treatment usually carried out by a person skilled in the art in order to obtain the sought mechanical properties.

[0040] It has been found that in the Ar-H 2 (5%) gas mixture at 980 °C for 100 hours isothermal holding treatment, the material thus obtained is significantly less sensitive to intergranular brittle fracture caused by environmentally assisted cracking, after polishing the outer surface of the sample The sensitivity can even be eliminat...

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Abstract

The invention relates to a processing method for cracking desensitisation using a nickel-based alloy environment having the following composition in wt %: C = 0,10%; Mn = 0,5%; Si = 0,5%; P = 0,015%; S = 0,015%; Ni = 40%; Cr = 12-40%; Co = 10%; Al = 5%; Mo = 0,1-15%; Ti = 5%; B 0,01%; Cu 5%; W = 0,1-15%, Nb = 0-10%, Ta = 10%; the balance consisting of Fe, and unavoidable impurities resulting from the manufacturing, characterised in that said alloy is maintained at 950-1160 DEG C in an atmosphere containing at least 100 ppm of hydrogen mixed with an inert gas or in pure hydrogen. The invention also relates to a part made of said Ni-based alloy having the above composition and subjected to said thermal processing.

Description

technical field [0001] The present invention relates to the metallurgy of nickel-based alloys, and more particularly to alloys useful in the manufacture of structural components of nuclear reactors or of fuel assemblies inserted in said reactors. Background technique [0002] Certain components of nuclear reactors are made of nickel-based alloys such as various types of Manufactured, such parts as heat exchangers, guide pins for rod bundles, pipes, screws and bolts for fixing steel elements used in the manufacture of light water nuclear reactors or with gas or molten salt or liquid Cooling circuit of a nuclear reactor with metallic heat transfer fluid. These parts should have good oxidation resistance, corrosion resistance, creep resistance, and resistance to cyclic thermal and mechanical stress over a long period of time (decades) at high temperature and pressure, and nickel-based alloys are well suited for these use. [0003] Certain structural components of fuel assem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C21D6/00C21D1/74C22C19/05C21D3/02C22F1/02
CPCC22F1/10C21D6/004C21D3/02C21D1/74C22C19/05
Inventor J-M·克鲁尔V·加拉特E·安德列尔J·德勒梅
Owner FRAMATOME ANP
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