Manufacturing method of reactor internals middle ring

Abstract

The invention discloses a method for manufacturing a reactor internal middle ring, which comprises the following steps of: a blank manufacturing stage: charging a raw material ingot into a furnace, heating to a forging temperature, repeatedly forging, upsetting and drawing out for multiple times, and punching by using a punch to obtain a blank meeting the requirement; a forming stage: chambering the blank by using a chambering tool to obtain a reactor internal middle ring blank forge piece; and in the heat treatment stage, the reactor internal middle ring blank forge piece is placed in a heat treatment furnace, proper technological parameters are controlled, and after the forge piece is evenly heated, the forge piece is taken out of the furnace and subjected to water cooling. According to the manufacturing method of the reactor internal middle ring, through optimized forging process control and heat treatment, the forging defects such as cracks and looseness can be effectively avoided, uniform and fine second-phase particles are mainly separated out in crystals, the situation that the second phase is separated out along the crystals is reduced, and the material obtains good comprehensive performance.

Description

Technical field [0001] The present invention relates to the field of forging technology in mechanical engineering, in particular to a method of manufacturing a ring in a reactor member. Background [0002] Reactor internal components are the core components of the reactor, which is located in the reactor pressure vessel, running under high temperature, high pressure, strong radiation, and long-term resistance to the erosion of cooling fluid, need to withstand the high electron injection of radiation and coolant corrosion, and to maintain sufficient strength at high temperature, load conditions, service conditions are very harsh, in the past mostly made of corrosion-resistant stainless steel materials. [0003] Due to the in-depth development of material research, nickel-based superalloys have become the development direction of a new generation of reactor internal member forging materials due to their good corrosion resistance and high high temperature strength. [0004] 0Cr15Ni7...

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Problems solved by technology

[0004] 0Cr15Ni70Ti3AlNb series alloys are materials strengthened by γ-phase formed by Ti and Al. They have large deformation resistance in the thermal processing range and a narrow thermal deformation window. If the temperature is too high, the grains will be coarsened, and the alloy will harden below a certain temperature. , continuous processing will cause cracks at lower temperature parts, resulting in surface or internal defects. The tensile strength and impact toughness of the reactor internals manufactured by the traditional reactor internals forging method cannot meet the operation and maintenance requirements of the reactor.

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