Hydrogen Traps and Hydrogen Induced Cracking in 20CrMo Steel

被引：8

作者：

Li, Wei ^{[1
,2
]}

Zhu, Xu ^{[1
]}

Yao, Jianjun ^{[3
]}

Jin, Xuejun ^{[1
,2
]}

Ding, Xifan ^{[4
]}

机构：

[1] Shanghai Jiao Tong Univ, Inst Adv Steels & Mat, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, Shanghai 200240, Peoples R China

[3] Asylum Res, 461 Hongcao Rd, Shanghai 200233, Peoples R China

[4] Shanghai Jiao Tong Univ, Sch Media & Design, Shanghai 200240, Peoples R China

来源：

ISIJ INTERNATIONAL | 2017年 / 57卷 / 01期

基金：

中国国家自然科学基金;

关键词：

hydrogen trapping; MnS inclusions; hydrogen induced cracking; scanning Kelvin probe force microscope; thermoelectric power; THERMOELECTRIC-POWER; EMBRITTLEMENT; BEHAVIOR; GENERATION; DIFFUSION; FRACTURE; FAILURE; SULFUR; ENERGY; ULTRA;

D O I：

10.2355/isijinternational.ISIJINT-2016-281

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The hydrogen trapping sites of commercial 20CrMo steel samples with electrochemically charged hydrogen were characterized by thermoelectric power (TEP) and scanning Kelvin probe force microscope (SKPFM). A surface potential drop of about 190 mV was found for the globular MnS inclusion and 150 mV for the elongated one due to the hydrogen absorption of MnS inclusions. Similar to thermal desorption measurement, TEP is a potential method in analyzing hydrogen traps of solid solution, dislocations and irreversible traps. The fracture morphology and hydrogen induced cracking can be explained by combined hydrogen embrittlement mechanisms. Although hydrogen induced cracks are found to initiate at the elongated inclusions, only longitudinal cracks were observed in this study which is not detrimental to the embrittlement.

引用

页码：170 / 175

页数：6

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