No, I have not used Liquid Nitrogen, I think it would work since it is about 200 degrees below zere, that should thermal shock anything, much like the opposite of using a torch and heating the rusty bolt. Where would you even buy liquid nitrogen ? There is probably a safety issue here since it will actually freeze your skin off , but then again the torch could burn your skin off.
If you ever try this, please tell me how it works. John