Influence of nitrogen alloying on hydrogen embrittlement in AISI 304-type stainless steels

Simo-Pekka Hannula, Hannu Hänninen, Seppo Tähtinen

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Hydrogen embrittlement of AISI 304-type austenitic stainless steels has been studied with special emphasis on the effects of the nitrogen content of the steels. Hydrogen charging was found to degrade the mechanical properties of all the steels studied, as measured by a tensile test. The fracture surfaces of hydrogen charged specimens were brittle cleavage-like whereas the uncharged specimens showed ductile, dimpled fracture. In sensitized materials transgranular cleavage mode of fracture was replaced by an intergranular mode of fracture and the losses of mechanical properties were higher. Nitrogen alloying decreased the hydrogen-induced losses of mechanical properties by increasing the stability of austenite. In sensitized steels the stability of austenite and nitrogen content were found to have only a minor effect on hydrogen embrittlement, except when sensitization had causedα′-martensite transformation at the grain boundaries.

Original languageEnglish
Pages (from-to)2205 - 2211
Number of pages7
JournalMetallurgical Transactions A: Physical Metallurgy and Materials Science
Volume15
Issue number12
DOIs
Publication statusPublished - 1984
MoE publication typeNot Eligible

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Hydrogen embrittlement
Alloying
Stainless steel
Nitrogen
Austenite
Mechanical properties
Hydrogen
Steel
Ductile fracture
Austenitic stainless steel
Martensite
Grain boundaries

Cite this

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title = "Influence of nitrogen alloying on hydrogen embrittlement in AISI 304-type stainless steels",
abstract = "Hydrogen embrittlement of AISI 304-type austenitic stainless steels has been studied with special emphasis on the effects of the nitrogen content of the steels. Hydrogen charging was found to degrade the mechanical properties of all the steels studied, as measured by a tensile test. The fracture surfaces of hydrogen charged specimens were brittle cleavage-like whereas the uncharged specimens showed ductile, dimpled fracture. In sensitized materials transgranular cleavage mode of fracture was replaced by an intergranular mode of fracture and the losses of mechanical properties were higher. Nitrogen alloying decreased the hydrogen-induced losses of mechanical properties by increasing the stability of austenite. In sensitized steels the stability of austenite and nitrogen content were found to have only a minor effect on hydrogen embrittlement, except when sensitization had causedα′-martensite transformation at the grain boundaries.",
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Influence of nitrogen alloying on hydrogen embrittlement in AISI 304-type stainless steels. / Hannula, Simo-Pekka; Hänninen, Hannu; Tähtinen, Seppo.

In: Metallurgical Transactions A: Physical Metallurgy and Materials Science, Vol. 15, No. 12, 1984, p. 2205 - 2211.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Influence of nitrogen alloying on hydrogen embrittlement in AISI 304-type stainless steels

AU - Hannula, Simo-Pekka

AU - Hänninen, Hannu

AU - Tähtinen, Seppo

PY - 1984

Y1 - 1984

N2 - Hydrogen embrittlement of AISI 304-type austenitic stainless steels has been studied with special emphasis on the effects of the nitrogen content of the steels. Hydrogen charging was found to degrade the mechanical properties of all the steels studied, as measured by a tensile test. The fracture surfaces of hydrogen charged specimens were brittle cleavage-like whereas the uncharged specimens showed ductile, dimpled fracture. In sensitized materials transgranular cleavage mode of fracture was replaced by an intergranular mode of fracture and the losses of mechanical properties were higher. Nitrogen alloying decreased the hydrogen-induced losses of mechanical properties by increasing the stability of austenite. In sensitized steels the stability of austenite and nitrogen content were found to have only a minor effect on hydrogen embrittlement, except when sensitization had causedα′-martensite transformation at the grain boundaries.

AB - Hydrogen embrittlement of AISI 304-type austenitic stainless steels has been studied with special emphasis on the effects of the nitrogen content of the steels. Hydrogen charging was found to degrade the mechanical properties of all the steels studied, as measured by a tensile test. The fracture surfaces of hydrogen charged specimens were brittle cleavage-like whereas the uncharged specimens showed ductile, dimpled fracture. In sensitized materials transgranular cleavage mode of fracture was replaced by an intergranular mode of fracture and the losses of mechanical properties were higher. Nitrogen alloying decreased the hydrogen-induced losses of mechanical properties by increasing the stability of austenite. In sensitized steels the stability of austenite and nitrogen content were found to have only a minor effect on hydrogen embrittlement, except when sensitization had causedα′-martensite transformation at the grain boundaries.

U2 - 10.1007/BF02647103

DO - 10.1007/BF02647103

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VL - 15

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JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

SN - 1073-5623

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