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High-strength Fe-Cr-Ni-Al multiplex stainless steel and manufacturing method therefor

A fe-cr-ni-al, stainless steel technology, applied in the field of high-strength Fe-Cr-Ni-Al multi-phase stainless steel, can solve the unsuitable manufacturing and application of thin nuclear fuel cladding, limited processability and bonding properties , degradation of mechanical properties, etc., to achieve excellent accident tolerance, excellent integrity, and high mechanical properties

Active Publication Date: 2018-11-09
KOREA ADVANCED INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, FeCrAl alloys show deterioration in mechanical properties due to thermal embrittlement of the single ferrite structure
FeCrAl alloys are not expected to be suitable for thin nuclear fuel cladding fabrication and applications due to their limited machinability and bonding properties

Method used

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  • High-strength Fe-Cr-Ni-Al multiplex stainless steel and manufacturing method therefor
  • High-strength Fe-Cr-Ni-Al multiplex stainless steel and manufacturing method therefor
  • High-strength Fe-Cr-Ni-Al multiplex stainless steel and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1.Fe-Cr-Ni-Al alloy

[0063]First, 46.67% by weight of iron (Fe), 23.64% by weight of chromium (Cr), and 24.15% by weight of nickel were melted at a melting temperature of 1300°C under an argon atmosphere of 450 Torr using a vacuum induction melting reactor. (Ni), 5.54% by weight of aluminum (Al), and based on 100 parts by weight of a combination of iron (Fe), chromium (Cr), nickel (Ni) and aluminum (Al), 0.48 parts by weight of Nb, 1.01 parts by weight Mn, 0.12 parts by weight of C, 0.31 parts by weight of Si and 0.0080 parts by weight of Ti for 2 hours. Then, a steel ingot of 42 kg was subjected to homogenization and solution annealing heat treatment at 1200° C. for 3 hours in an air furnace, and then subjected to cooling in the furnace to obtain a block having a thickness of 30 mm. Thereafter, hot rolling was performed at 1150° C. 8 times to obtain an alloy having a thickness of 3 mm.

[0064] The rolled alloy was subjected to a preliminary heat treatmen...

Embodiment 2

[0065] Embodiment 2.Fe-Cr-Ni-Al alloy

[0066] In addition to using 52.11% by weight of iron (Fe), 20.96% by weight of chromium (Cr), 21.48% by weight of nickel (Ni), 5.50% by weight of aluminum (Al), and based on 100 parts by weight of iron (Fe), chromium (Cr), nickel (Ni) and aluminum (Al) combination of 0.52 parts by weight of Nb, 1.04 parts by weight of Mn, 0.12 parts by weight of C, 0.32 parts by weight of Si and 0.0056 parts by weight of Ti, repeating Example 1 to obtain stainless steel.

Embodiment 3

[0067] Embodiment 3.Fe-Cr-Ni-Al alloy

[0068] In addition to using 58.76% by weight of iron (Fe), 16.33% by weight of chromium (Cr), 18.77% by weight of nickel (Ni), 6.14% by weight of aluminum (Al), and based on 100 parts by weight of iron (Fe), chromium (Cr), nickel (Ni) and aluminum (Al) combination of 0.53 parts by weight of Nb, 1.04 parts by weight of Mn, 0.11 parts by weight of C and 0.31 parts by weight of Si, Example 1 was repeated to obtain stainless steel.

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Abstract

The present invention relates to a high-strength Fe-Cr-Al-Ni multiplex stainless steel and a manufacturing method therefor. The multiplex stainless steel comprises 35 to 67 wt % of iron (Fe), 13 to 30wt % of chrome (Cr), 15 to 30 wt % of nickel (Ni), and 5 to 15 wt % of aluminum (Al) and has a multiplex structure in which an austenite phase accounting for high ductility, a ferrite phase accounting for high strength, and an NiAl (B2) phase providing both strength and high-temperature steam oxidation resistance, exist in combination. The multiplex stainless steel can secure necessary processability and mechanical toughness even if in a thin state, can maintain integrity as a structural member in a normal operation condition of a light-water reactor thanks to the formation of a chrome oxidefilm thereon, and can form a stable oxide film including alumina under a high-temperature steam environment, which is plausible in a high-temperature nuclear accident, thereby providing exceptionallyimproved resistance to serious accidents.

Description

technical field [0001] The present disclosure relates to high-strength Fe-Cr-Ni-Al multiphase stainless steel, which is a stainless steel having a multiphase structure comprising a combination of an austenite phase, a ferrite phase and a NiAl(B2) phase and containing 5% by weight or more of aluminum, the present disclosure also relates to methods of making the material. High-strength Fe-Cr-Ni-Al multiphase stainless steels exhibit excellent mechanical properties, which form stable oxide layers in pressurized water reactors under water chemistry and high-temperature steam environments, thus making them useful in both normal and accidental operation of light water reactors. Provides high resistance to oxidation in the environment. Background technique [0002] In atomic power stations, when there is an accident in the nuclear fuel cladding, supporting grid or nuclear reactor structure used for nuclear fuel assemblies, they are oxidized by metals in a high temperature environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40C22C38/06C22C38/48C22C38/04C22C38/02C21D8/00G21C3/07C22C38/34
CPCC21D8/00C22C38/02C22C38/04C22C38/06C22C38/34C22C38/40C22C38/48G21C3/07C21D6/004C21D8/0205C21D8/0226C21D8/0236C21D8/0263C21D9/46C22C38/50Y02E30/30C21D2211/001C21D2211/004C21D2211/005C22C38/18
Inventor 张仓喜金贤明戈库尔·奥布兰·苏布拉马尼安虚珍许李豪中洪晟熏金采源
Owner KOREA ADVANCED INST OF SCI & TECH
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