Effect of niobium content on the precipitation behavior and mechanical properties of Ni-Cr alloys

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-01 DOI:10.1016/j.jallcom.2025.184095

Guangchang Yang, Yanchang Qi, Zhaobo Li, Zhijie Zhang, Chengyong Ma

{"title":"Effect of niobium content on the precipitation behavior and mechanical properties of Ni-Cr alloys","authors":"Guangchang Yang, Yanchang Qi, Zhaobo Li, Zhijie Zhang, Chengyong Ma","doi":"10.1016/j.jallcom.2025.184095","DOIUrl":null,"url":null,"abstract":"The effect of niobium content on the precipitation behavior and mechanical properties of Ni-Cr alloys, both in as-deposited and heat-treated states, was investigated. Microscopic characterization results revealed that the microstructures of the Ni-Cr alloys consisted of γ dendrites arranged in parallel along the deposition direction. The primary precipitation phase identified was MC (M=Nb, Ti), located between the dendritic crystals. In alloys with a 2.13 wt.% Nb content, Cr<sub>23</sub>C<sub>6</sub> is discretely distributed along the grain boundaries. When the Nb content increases to 3.00 wt.%, Laves phases emerge within the grains. Mechanical analysis results indicated that the austenite grains were refined in the as-deposited alloys and the area fraction of precipitates increased from 0.68% to 0.79% with the increase in Nb content, leading to enhanced strength and hardness of the alloys. Post heat treatment promoted the formation of MC (M = Nb, Ti) precipitates, resulting in a significant increase in the area fraction of these precipitates. This led to a slight decrease in impact energy value, but a marked increase in alloy strength. The heat-treated alloys with 3.00 wt.% Nb content exhibited the highest tensile strength of 675 MPa.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"101 1","pages":""},"PeriodicalIF":6.3000,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Alloys and Compounds","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.jallcom.2025.184095","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The effect of niobium content on the precipitation behavior and mechanical properties of Ni-Cr alloys, both in as-deposited and heat-treated states, was investigated. Microscopic characterization results revealed that the microstructures of the Ni-Cr alloys consisted of γ dendrites arranged in parallel along the deposition direction. The primary precipitation phase identified was MC (M=Nb, Ti), located between the dendritic crystals. In alloys with a 2.13 wt.% Nb content, Cr₂₃C₆ is discretely distributed along the grain boundaries. When the Nb content increases to 3.00 wt.%, Laves phases emerge within the grains. Mechanical analysis results indicated that the austenite grains were refined in the as-deposited alloys and the area fraction of precipitates increased from 0.68% to 0.79% with the increase in Nb content, leading to enhanced strength and hardness of the alloys. Post heat treatment promoted the formation of MC (M = Nb, Ti) precipitates, resulting in a significant increase in the area fraction of these precipitates. This led to a slight decrease in impact energy value, but a marked increase in alloy strength. The heat-treated alloys with 3.00 wt.% Nb content exhibited the highest tensile strength of 675 MPa.

查看原文本刊更多论文

铌含量对Ni-Cr合金析出行为和力学性能的影响

研究了铌含量对Ni-Cr合金沉积态和热处理态析出行为和力学性能的影响。显微表征结果表明，Ni-Cr合金的显微组织由沿沉积方向平行排列的γ枝晶组成。初生析出相为MC (M=Nb, Ti)，位于枝晶之间。在Nb含量为2.13 wt.%的合金中，Cr23C6沿晶界离散分布。当Nb含量增加到3.00 wt.%时，晶粒内部出现Laves相。力学分析结果表明，随着铌含量的增加，沉积态合金的奥氏体晶粒细化，析出相的面积分数从0.68%增加到0.79%，合金的强度和硬度得到提高。热处理后促进了MC （M = Nb, Ti）析出相的形成，使MC （M = Nb, Ti）析出相的面积分数显著增加。这导致冲击能值略有下降，但合金强度明显增加。Nb含量为3.00 wt.%的热处理合金抗拉强度最高，达到675 MPa。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.