EP 0178894 A2 19860423 - A method of heat treating high chromium cast ferrous-based alloys and a wearing element formed of a high chromium cast ferrous based alloy.
Title (en)
A method of heat treating high chromium cast ferrous-based alloys and a wearing element formed of a high chromium cast ferrous based alloy.
Title (de)
Verfahren zur Wärmebehandlung hochchromhaltiger Gusseisenlegierungen und Verschleissteil aus einer hochchromhaltigen Gusseisenlegierung.
Title (fr)
Procédé de traitement thermique de fonte à haute teneur en chrome et une pièce d'usure en fonte à haute teneur en chrome.
Publication
Application
Priority
GB 8426222 A 19841017
Abstract (en)
A method of heat treating a component formed of a high-chromium cast ferrous-based alloy consisting of 11-28 wt% chromium, 1 - 3.6 wt% carbon and at least 0.2 wt% molybden um and/or at least 0.6 wt% tungsten, the remainder (apart from any incidental ingredients and impurities) being iron, said method comprising the steps of:- a) holding said component at a temperature between the solidus temperature of the alloy and 1050 DEG C for a period of time not exceeding 3 days in a non-oxidising atmosphere or vacuum so as to produce a partially spheroidised hard carbide phase in an austenitic matrix throughout the component, and b) quenching the component at a mean rate of from 40 DEG C/min to 3 DEG C/min in the critical temperature range in order to retain the austenitic matrix. Before heat treament, carbon and chromium form a hard sharp, angular carbide phase and the molybdenum and/or tungsten serves to increase the rate of change in the morphology of the carbidge phase during heat treatment from sharp angularity to a partly spheroidised morphology.
IPC 1-7
IPC 8 full level
C21D 6/00 (2006.01); C22C 37/06 (2006.01)
CPC (source: EP)
C21D 6/002 (2013.01); C22C 37/06 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0178894 A2 19860423; EP 0178894 A3 19870624; GB 2167438 A 19860529; GB 2167438 B 19881123; GB 8525382 D0 19851120
DOCDB simple family (application)
EP 85307389 A 19851015; GB 8525382 A 19851015