| 摘要 |
<p>Articles produced by a powder metallurgy process involving forming of a shape by compaction followed by sintering without the application of external pressure from a stainless steel alloy powder produced by rapid atomisation followed by an annealing treatment, which powder consists essentially of, in weight percent, chromium 14 to 30, molybdenum 1 to 5, vanadium 0 to 5, tungsten 0 to 6, silicon 0 to 1.5, carbon minimum as specified below to one fifth chromium content minus 2, other strong carbide forming elements (e.g. Nb, Ta, Ti) totalling together 0 to 5, the total of Mo, V and W being at least 3, the balance being iron including incidental impurities; the alloy powder (including any addition of free graphite powder mixed therewith before sintering) having a sufficient carbon content to form carbides with all the Mo, V, W and other strong carbide forming elements present; the articles consisting of a distribution of carbides embedded in a substantially ferritic matrix containing at least 12 % by weight of chromium in solution, and which articles do not require further heat treatment.</p> |
