C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 8/22 (2006.01) C21D 1/06 (2006.01) C21D 9/00 (2006.01) C22C 38/00 (2006.01) C22C 38/22 (2006.01) C23C 8/80 (2006.01)
Patent
CA 2594838
A high-concentration carburized/low-strain quenched member that in the field of high-concentration carburization quenching characterized by high strength, high surface pressure, etc., simultaneously attains realization of high performance and minimization of heat treatment strain. As the process for producing the same, there is provided a process for producing a high- concentration carburized/low-strain quenched member, characterized by including a primary treatment in which according to vacuum carburization (low- pressure carburization) technique, a steel member for mechanical structure is heated to temperature within the austenite region, subsequently a solid dissolution of carbon amounting to >= eutectoid carbon concentration is effected in the surface layer portion of the member and thereafter the member is quenched at a cooling rate of 3~ to 15~C/sec from the temperature within the austenite region to temperature of <= A1 transformation point so that in the surface layer portion of the member, there are generated fine carbide and/or nuclei thereof; and a secondary treatment in which continuously the member is subjected to temperature raising to temperature within the austenite region and soaking and thereafter the member is rapidly quenched so that in the outermost surface layer portion, fine carbide is precipitated in an effective hardening depth ratio ranging from 10 to 30%.
L~invention concerne un élément trempé de faible contrainte/carburé de forte concentration qui dans le domaine de la trempe de carburation de forte concentration caractérisée par une résistance élevée, une pression superficielle élevée, etc., obtient simultanément des performances élevées et la réduction de la contrainte de traitement thermique. Comme processus de fabrication idoine, l~invention concerne un processus de fabrication d~un élément trempé de faible contrainte/carburé de forte concentration, caractérisé par l~inclusion d~un traitement primaire dans lequel selon une technique de carburation sous vide (carburation basse pression), un élément d~acier pour structure mécanique est porté à une température comprise dans la région austénite, puis l~on effectue une dissolution solide d~une quantité de carbone >= à la concentration de carbone eutectoïde dans la portion de couche superficielle de l~élément, avant de tremper l~élément à une vitesse de refroidissement de 3° à 15°C/sec à partir de la température dans la région austénite jusqu~à une température <= au point de transformation A1 pour que dans la portion de couche superficielle de l~élément, on génère du carbure fin et/ou des noyaux de celui-ci ; et un traitement secondaire dans lequel l~élément est soumis en continu à une montée en température jusqu'à une température dans la région austénite et une immersion, avant de tremper rapidement l~élément pour que dans la portion de couche superficielle la plus externe, du fin carbure soit précipité dans un rapport de profondeur de durcissement effectif compris entre 10 et 30%.
Abe Hisashi
Fukushima Toshio
Horikiri Koji
Machida Isao
Marks & Clerk
Parker Netsushori Kogyo K.k.
LandOfFree
High-concentration carburized/low-strain quenched member and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High-concentration carburized/low-strain quenched member and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-concentration carburized/low-strain quenched member and... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1719505