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Quenching would be done in a low temperature molten salt bath that will melt at a lower temperature as opposed to a high temperature salt bath. You can marquench (also known as martempering) with it by quenching the austenetic steel in it a holding it in the low temperature bath until the austenite converts to bainite or a mixture of bainite and martensite, depending on the alloy and the temperature and time selected. It's safer than using oil for the process but making a blade with all bainite or a mixture of bainite and martensite is a questionable process so I'd skip it.
You could also use a low temperature salt bath in place of an oven for regular tempering if you have a salt that will melt in the range that you want. The only advantage that I could see is that the molten salts would transfer heat better the the blade.
Doug
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