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上面提到的锻法能引起碳化物长大。下面是退火处理来消除应力。必须要在锻后马上进行。
“In order that the steel shall be able to be machined by means of cutting tools, it first must be soft annealed. This is carried out at a temperature below 950°C, preferably at about 900°C, in order to inhibit growth of the carbides/nitrides/carbonitrides. The soft annealed material therefore is characterized by a very finely dispersed distribution of MX-particles in a ferritic matrix, which contains 8-15 vol-% MX-carbides, nitrides and/or carbonitrides of which at least 90 vol% has an equivalent diameter which is smaller than 3.0 µm and which preferably also is smaller than 2.5 µm, and max. 3 vol-% of other carbides, nitrides and/or carbonitrides. ”
此段reference quote 摘自:
http://www.freepatentsonline.com/EP1397524.html
作者:Sandberg, Odd (Strandvägen 28, S-683 40 Uddeholm, SE)
Tidesten, Magnus (Rågvägen 3, S-683 34 Hagfors, SE)
Jönsson, Lennart (Hööksgatan 2A, S-652 29 Karlstad, SE) |
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