铸造CrCoNi中熵合金碳化物析出行为及力学性能

缪良田; 杜辉; 胡光武

doi:10.15980/j.tzzz.2021.06.016

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铸造CrCoNi中熵合金碳化物析出行为及力学性能
Carbide Precipitation Behavior and Mechanical Properties of the Casting CrCoNi Medium-entropy Alloy
2021年41卷第6期页码：738-742
纸质出版日期： 2021 ，
DOI： 10.15980/j.tzzz.2021.06.016

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[1]缪良田,杜辉,胡光武.铸造CrCoNi中熵合金碳化物析出行为及力学性能[J].特种铸造及有色合金,2021,41(06):738-742.

Miao Liangtian, Du Hui, Hu Guangwu. Carbide Precipitation Behavior and Mechanical Properties of the Casting CrCoNi Medium-entropy Alloy[J]. Special Casting & Nonferrous Alloys, 2021,41(6):738-742.
[1]缪良田,杜辉,胡光武.铸造CrCoNi中熵合金碳化物析出行为及力学性能[J].特种铸造及有色合金,2021,41(06):738-742. DOI： 10.15980/j.tzzz.2021.06.016.

Miao Liangtian, Du Hui, Hu Guangwu. Carbide Precipitation Behavior and Mechanical Properties of the Casting CrCoNi Medium-entropy Alloy[J]. Special Casting & Nonferrous Alloys, 2021,41(6):738-742. DOI： 10.15980/j.tzzz.2021.06.016.

摘要

针对铸造CrCoNi中熵合金室温强度低的问题

添加了3%（摩尔分数

下同）的Mo和0.5%的C

研究了碳化物的析出行为及其对合金的相结构、微观组织、硬度和室温压缩性能的影响。制备工艺采用传统的电弧熔炼、滴铸、固溶（1 250℃×6 h）和时效（950℃×1 h）处理

制备的铸造合金中析出了弥散分布的M

碳化物。细小的碳化物均匀分布在晶粒内部

粗大的碳化物分布在晶界。经碳化物强化后

CrCoNi合金的硬度（HV）由157增加到250

屈服强度由223 MPa提高到342 MPa

强化效果主要归因于碳化物的析出强化。

Abstract

In order to enhance the room-temperature strength of a casting CrCoNi medium-entropy alloy

3% Mo and 0.5% C were added into the alloy. The carbide precipitation behavior and its effects on phase structure

microstructure

hardness and compressive properties at room temperature of the CrCoNi alloy were investigated. Traditional processes including arc melting

drop-casting

solid solution treatment at 1 250 ℃ for 6 h and aging at 950 ℃ for 1 h were adopted. The dispersed carbides are precipitated from the alloy after aging. Fine carbides are evenly distributed in the intragranular regions

and coarse carbides are distributed on the grain boundaries. The hardness of the（CrCoNi）

96.5

0.5

alloy is increased from 157 HV of the CrCoNi alloy to 250 HV

and the yield strength at room temperature is increased from 223 MPa to 342 MPa

which is attributed to the precipitation strengthening of carbide.