A Precipitation Hardening Stainless Steel with Multicomponent Composition Based on High Entropy Effect

A technology of precipitation hardening and stainless steel, which is applied in the field of design and development of new precipitation hardening stainless steel components with multi-component components, can solve the problems of undiscovered age hardening performance, improve solid solution strengthening effect, improve corrosion resistance, and increase lattice distortion effect

Active Publication Date: 2018-11-06
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the iron addition content in this alloy design is limited to less than 35mol.%
After that, the applicant of the present invention tried to increase the content of Fe element to 50

Method used

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  • A Precipitation Hardening Stainless Steel with Multicomponent Composition Based on High Entropy Effect
  • A Precipitation Hardening Stainless Steel with Multicomponent Composition Based on High Entropy Effect
  • A Precipitation Hardening Stainless Steel with Multicomponent Composition Based on High Entropy Effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A multi-component precipitation-hardening stainless steel based on the high-entropy effect. The main component given in this example is configured as Fe according to the molar percentage 65 Cr 13 Ni 3.16 co 3.16 mn 3.16 Mo 3.16 al 3.16 Ti 3.16 Cu 3 , do not add carbon, the purity of the selected alloy elements to add raw materials is ≥ 99%, intercept an appropriate amount of raw materials from the base metal, use mechanical grinding to remove the oxide skin on the surface of the raw metal, and then the components designed in this embodiment are composed of The molar ratio is converted into a weight ratio, and the raw materials are weighed by an electronic balance with an induction capacity of 0.1 mg, and mixed uniformly. The total weight of the mixed raw materials is about 30g. Subsequently, the configured raw materials were placed in the copper crucible in the WK non-consumable vacuum electric arc furnace developed by Shenyang Vacuum Technology Research Institu...

Embodiment 2

[0026] A multi-component precipitation-hardening stainless steel based on the high-entropy effect. The main components given in this example are shown in Table 2 Nos. 1-3, and No. 2 and No. 3 have added trace elements of C and Nb on the basis of No. 1. The purity of the raw materials for the capacity of the selected alloying elements is greater than or equal to 99%, and the smelting preparation and aging treatment methods are as described in Example 1. As can be seen from the properties described in Table 2, the maximum aging hardness of No. 1-3 samples is higher than that of the 17-4PH (0Cr17Ni4Cu4Nb) sample maximum aging hardness 476HV prepared by the same smelting and aging process, adding a small amount of C and Nb is beneficial to further Improve the aging hardness of stainless steel. The corrosion resistance immersion test shows that the corrosion resistance of No. 1-3 samples is higher than that of No. 17-4PH samples.

Embodiment 3

[0028] A multi-component precipitation-hardening stainless steel based on the high-entropy effect. The main components given in this example are shown in No. 4-6 in Table 2. No. 4-6 mainly changes the Fe content on the basis of No. 1 composition, and changes the Cr content accordingly. Element content, No. 6 did not add Cu. The purity of the raw materials for the capacity of the selected alloying elements is greater than or equal to 99%, and the smelting preparation and aging treatment methods are as described in Example 1. It can be seen from the properties described in Table 2 that the maximum aging hardness of No. 4-6 samples is higher than that of the 17-4PH (0Cr17Ni4Cu4Nb) sample prepared by the same smelting and aging process, the maximum aging hardness is 476HV. The corrosion resistance immersion test shows that the corrosion resistance of No. 4, No. 5 and No. 6 samples is higher than that of the 17-4PH sample.

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Abstract

The invention discloses a multi-component precipitation-hardening stainless steel based on a high-entropy effect and belongs to the technical field of metal materials and manufacturing. In design components of the stainless steel, the content of Fe serving as a matrix element is 60-75%, the content of Cr serving as a primary corrosion-resisting element is 13-20%, and meanwhile primary alloy elements including Ni, Cu, Mn, Al, Ti, Co and Mo are added according to an equal molar ratio or a nearly equal molar ratio, wherein the content of the added elements is 2-5 at.%. The stainless steel is obviously superior to 0Cr17Ni4Cu4Nb precipitation-hardening stainless steel prepared under the same solidification condition on the aspects of dilute sulfuric acid corrosion resistance and ageing hardness, the ageing hardness temperature is 470-530 DEG C, and the precipitation-hardening stainless steel is widely applicable to the fields of precipitation-hardening stainless steel materials having high requirements for the material hardness and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of metal materials and manufacturing, and specifically relates to the design and development of a new type of precipitation-hardening stainless steel composition based on high-entropy effects. Background technique [0002] Stainless steel is a typical representative of solid solution alloy steel. A lot of research has been carried out at home and abroad on its structure, composition, effect of alloying elements, and phase structure control, and developed martensite, ferrite, austenite, austenite-ferrite Dozens of mature component systems such as body duplex and precipitation hardening can meet the requirements of different service conditions. Among them, precipitation hardening (also known as age hardening) stainless steel is the research hotspot of a new generation of high-strength stainless steel in recent years. Through aging, fine intermetallic compounds and some small amounts of carbides are precipitate...

Claims

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Application Information

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IPC IPC(8): C22C38/40C22C38/50C22C38/58C22C38/52C22C38/44C22C38/42C22C38/06C22C38/02C22C38/48
CPCC22C38/02C22C38/06C22C38/40C22C38/42C22C38/44C22C38/48C22C38/50C22C38/52C22C38/58
Inventor 张晖
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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