FR2063287A5 - Gaseous nitriding of steels - Google Patents

Gaseous nitriding of steels

Info

Publication number
FR2063287A5
FR2063287A5 FR6930780A FR6930780A FR2063287A5 FR 2063287 A5 FR2063287 A5 FR 2063287A5 FR 6930780 A FR6930780 A FR 6930780A FR 6930780 A FR6930780 A FR 6930780A FR 2063287 A5 FR2063287 A5 FR 2063287A5
Authority
FR
France
Prior art keywords
layer
ferrite
article
temp
fatigue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
FR6930780A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PEUGEOT and RENAULT
Renault SAS
Original Assignee
PEUGEOT and RENAULT
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PEUGEOT and RENAULT, Renault SAS filed Critical PEUGEOT and RENAULT
Priority to FR6930780A priority Critical patent/FR2063287A5/en
Application granted granted Critical
Publication of FR2063287A5 publication Critical patent/FR2063287A5/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces

Abstract

Steel and similar alloys are surface nitrided in the gaseous phase to form a surface layer >5 mu thick of epsilon-iron nitride and a N-rich carbonitride phase based on cementite, the layer being homogeneous and continuous giving a negative reaction test with 5% ammonia cal copper chloride. Beneath this layer is a diffusion zone comprising a solid soln. of C and N in ferrite. The process is effected at a temp. above the critical transformation temp. and the article is thermally treated such as to prevent the formation of martensite in the core or produce fatigue strain in the quenched ferrite. The treatment improves the fatigue, abrasion and corrosion resistance of the article.
FR6930780A 1969-09-10 1969-09-10 Gaseous nitriding of steels Expired FR2063287A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR6930780A FR2063287A5 (en) 1969-09-10 1969-09-10 Gaseous nitriding of steels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6930780A FR2063287A5 (en) 1969-09-10 1969-09-10 Gaseous nitriding of steels

Publications (1)

Publication Number Publication Date
FR2063287A5 true FR2063287A5 (en) 1971-07-09

Family

ID=9039882

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6930780A Expired FR2063287A5 (en) 1969-09-10 1969-09-10 Gaseous nitriding of steels

Country Status (1)

Country Link
FR (1) FR2063287A5 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2162654A1 (en) * 1971-12-10 1973-07-20 Barkas Werke Veb Accelerated gas nitriding process - for (ferrous) metals using carbon monoxide in ammonical nitriding gas
US4003764A (en) * 1973-05-17 1977-01-18 Firma J. Aichelin Preparation of an ε-carbon nitride surface layer on ferrous metal parts
US4163680A (en) * 1975-11-21 1979-08-07 Syrchikov Sergei A Process for carbonitriding steel and cast iron articles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2162654A1 (en) * 1971-12-10 1973-07-20 Barkas Werke Veb Accelerated gas nitriding process - for (ferrous) metals using carbon monoxide in ammonical nitriding gas
US4003764A (en) * 1973-05-17 1977-01-18 Firma J. Aichelin Preparation of an ε-carbon nitride surface layer on ferrous metal parts
US4163680A (en) * 1975-11-21 1979-08-07 Syrchikov Sergei A Process for carbonitriding steel and cast iron articles

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Legal Events

Date Code Title Description
ST Notification of lapse