Method for solution hardening of cold deformed workpieces of passivating alloys, and components solution hardened by this method
A technology of cold deformation and alloying, applied in the direction of connecting components, metal material coating process, manufacturing tools, etc., can solve the problem of not being able to provide high core strength and achieve good corrosion resistance
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example 1
[0075] Keyed lock washers of cold deformed austenitic stainless steel (AISI316) hardened by prior art methods and by the method of the invention.
[0076] Two identical keyed lock washers of cold-formed austenitic stainless steel AISI316L are hardened. FIG. 2 shows a keyed washer set 1 of said keyed washer 2 and its use. Each washer 2 has a first side 3 with radial teeth 4 and an opposite cam side 5 with a cam 6 . During use of the keyed washer set 1 , the washer 2 is placed facing each other with the cam side 5 as shown. Both keyed lock washers are solution hardened using nitrogen and carbon at a temperature of 440°C. One gasket was hardened using the method of the invention, ie in a high temperature process followed by a low temperature process, and the other gasket was directly case hardened using the same low temperature process, ie prior art. The gasket was analyzed using an optical microscope. image 3 and Figure 4 On the left side is shown a gasket only surface ha...
example 2
[0079] A cold-formed austenitic stainless steel (AISI 316) is hardened by the method of the prior art as well as by the method of the invention.
[0080] Two identical parts (back ferrules) of cold-formed austenitic stainless steel AISI316 were solution hardened using nitrogen and carbon at a temperature of 440 °C. One part was hardened using the method of the invention, ie in a high temperature process followed by a low temperature process, and the other part was directly case hardened using the same low temperature process. Figure 5 On the left is shown a microstructural analysis using an optical microscope of a part that was case hardened using only the nitrocarburizing process performed at 440°C using a gas containing nitrogen and carbon. Atmospheric pressure at temperature for 12 hours. The outer surface in the nitrogen-containing region exhibits partial sensitization with significant CrN precipitates appearing on the outermost surface. Figure 5 On the right is shown ...
example 3
[0082] Cold deformed austenitic stainless steel AISI 304 sheets were hardened by methods of the prior art as well as by the method of the invention.
[0083] Two identical cold-rolled (deformed) components of austenitic stainless steel sheet AISI304 were solution hardened using nitrogen and carbon at a temperature of 440 °C. One part was hardened using the method of the invention, ie in a high temperature process followed by a low temperature process, and the other part was directly case hardened using the same low temperature process. Figure 6 On the left is shown a component surface-hardened only using the nitrocarburizing process performed using a gas containing nitrogen and carbon at a temperature of 440°C for 20 hours and subsequently exposed to Corrosion tests were carried out in a 14% by weight sodium hypochlorite solution for 70 minutes. Figure 6 On the right is shown a part treated using the method of the invention. The part is exposed to a nitrogen-containing atm...
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Abstract
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