Cr、V和Mo碳化物对回火马氏体钢抗氢脆性能影响的对比研究。

Comparative study on the effects of Cr, V, and Mo carbides for hydrogen-embrittlement resistance of tempered martensitic steel.

作者信息

Lee Junmo, Lee Taekyung, Mun Dong-Jun, Bae Chul Min, Lee Chong Soo

机构信息

Pohang Research Lab, POSCO, Pohang, 37877, Korea.

School of Mechanical Engineering, Pusan National University, Busan, 46241, Korea.

出版信息

Sci Rep. 2019 Mar 26;9(1):5219. doi: 10.1038/s41598-019-41436-2.

DOI:10.1038/s41598-019-41436-2

PMID:30914723

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6435655/

Abstract

In this study, the ideal alloying element (among Cr, V, and Mo carbides) to enhance the resistance to hydrogen embrittlement (HE) in a tempered martensitic steel was investigated. Four types of steels were designed to contain cementites, Cr-rich MC carbides, V carbides, and Mo carbides, respectively. These steels were tailored to possess a comparable tensile strength (~1.6 GPa). The HE resistances of these steels were evaluated through the slow strain rate test and cyclic corrosion test. The results showed an enhanced HE resistance, characterized by a high notch fracture strength after hydrogen charging, in the samples containing V carbides and Mo carbides. In particular, Mo carbide was regarded as the most ideal alloying element for HE resistance because of the high resistivity parameter, inhibited hydrogen penetration, and suppressed strength loss by internal hydrogen.

摘要

在本研究中，对回火马氏体钢中增强抗氢脆（HE）性能的理想合金元素（在Cr、V和Mo碳化物中）进行了研究。设计了四种类型的钢，分别含有渗碳体、富Cr的MC碳化物、V碳化物和Mo碳化物。这些钢经过定制，具有相当的抗拉强度（约1.6 GPa）。通过慢应变速率试验和循环腐蚀试验评估了这些钢的抗氢脆性能。结果表明，含有V碳化物和Mo碳化物的样品具有增强的抗氢脆性能，其特征是充氢后具有较高的缺口断裂强度。特别是，由于高电阻率参数、抑制氢渗透以及抑制内部氢导致的强度损失，Mo碳化物被认为是抗氢脆最理想的合金元素。