Microstructural characterization of grade 300 and grade 350 maraging steels and electrochemical study in hydrofluoric solution

被引：12

作者：

Cerra Florez, Mauro Andres ^{[1
,2
]}

Pereira, Ursula Cid ^{[1
]}

Cardoso, Jorge Luiz ^{[1
]}

dos Santos Oliveira, Francisco Jose ^{[1
]}

Araujo, Walney Silva ^{[1
]}

Ribas, Gemma Fargas ^{[2
]}

Gomes de Abreu, Hamilton Ferreira ^{[1
]}

Gomes da Silva, Marcelo Jose ^{[1
]}

机构：

[1] Univ Fed Ceara, Dept Met & Mat Engn, Campus Pici,Bloco 729, BR-60440900 Fortaleza, Ceara, Brazil

[2] Univ Politecn Cataluna, CIEFMA, Dept Mat Sci & Engn, EEBE Campus Diagonal Besos, Barcelona 08019, Spain

来源：

JOURNAL OF FLUORINE CHEMISTRY | 2021年 / 243卷

关键词：

Aqueous corrosion; Heat treatments; Hydrofluoric acid; Maraging steels; Raman analysis;

D O I：

10.1016/j.jfluchem.2021.109738

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The electrochemical behavior of solution-annealed grade 300 and grade 350 maraging steels subjected to two different aging temperatures in an aqueous hydrofluoric acid (HF) medium was evaluated. The microstructural and hardness studies showed the effects of the chemical composition and heat treatments on the material properties. Although it is not possible to observe them, the fine intermetallic composites deposited during aging allow a significant increase in the hardness of materials, which was reduced when aged at 560 degrees C, where there was formation of reverted austenite. The results showed that, in both steels, solution-annealed samples that were not aged showed a better corrosion behavior than the aged samples. The reversion of austenite during aging at temperatures above 560 degrees C increases the phase limits and its susceptibility to corrosion. The greater amount of cobalt and titanium in grade 350 maraging steel increases the amount of fine intermetallic precipitate rich in molybdenum and titanium during aging, therefore improving its mechanical properties, but also reducing its corrosion resistance.

引用

页数：11

共 40 条

[21] EBSD study of early fractured phenomena in a 350 grade Maraging steel elbows exposed to hydrofluoric acid [J].