Research programs were conducted to select the free-machining additive that would greatly increase the machinability of AISI 8620- and 4140-type steels without adversely affecting their hot workability, chemical homogeneity, and mechanical and metallurgical properties. The additives investigated were sulfur, selenium, tellurium, lead, and bismuth.The principal findings were as follows: On the basis of these studies, it is concluded that selenium is the optimum additive, and that the machinability of 8620-and 4140-type steels containing nominally 0.10% selenium is superior to that of commercially available 8620 and 4140 free-machining steels.
Effect of Additives on the Machinability and Properties of Alloy-Steel Bars
Sae Technical Papers
1973 International Automotive Engineering Congress and Exposition ; 1973
1973-02-01
Aufsatz (Konferenz)
Englisch
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