oghshf Posted December 26, 2012 Share Posted December 26, 2012 for some bundle we quenched in water and oil, the structure has ferrite with martensite and bainite.austenitizing temp. 860CHolding time: 60 minDipping time:300 secondsmoving time: 100secondshas anyone knowledge about existence of ferrite in quench microstructure? Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted December 26, 2012 Share Posted December 26, 2012 a few things can effect the results, such as dimentions, because thinner cross sections will cool faster than thicker, also rate of quench was not stated, not aware of many water and oil quenches, how do you keep the oil suspended, and what is its quench rate compared to water or a fast straight oil? Quote Link to comment Share on other sites More sharing options...
oghshf Posted January 9, 2013 Author Share Posted January 9, 2013 a few things can effect the results, such as dimentions, because thinner cross sections will cool faster than thicker, also rate of quench was not stated, not aware of many water and oil quenches, how do you keep the oil suspended, and what is its quench rate compared to water or a fast straight oil? thanks for your pay attention, what's the meaning of "how do you keep the oil suspendedhow do you keep the oil suspended" , really i can't realize the meaning of suspended for oil. the quench rate of oil is good, beacause in some products of AISI 4337 , we have quenching cracks. Quote Link to comment Share on other sites More sharing options...
billyO Posted January 9, 2013 Share Posted January 9, 2013 what's the meaning of "how do you keep the oil suspended" I believe what Steve is referring to is the fact that oil and water doesn't mix, chemically/physically, unlike,say, salt and water. The salt dissolves in water, oil will not. The best you can do is stir the oil and water rapidly enough to break the puddle of oil into many tiny drops that are "suspended" in the water, not truly dissolved. As time passes, the oil, being less dense will form into a puddle again on the top and separate, whereas the only way to remove salt, once dissolved (a solution) is to evaporate the water. So...if you're quenching liquid is a mix of oil and water, the question remains, "how do you make sure you have a uniform solution for a uniform quench?" the quench rate of oil is good, beacause in some products of AISI 4337 , we have quenching cracks. I believe that what Steve is referring to here is the actual rate of cooling for the liquid (degrees of temperature change over time) you are using so that you can compare to cooling rate curve of your specific alloy to determine the percent martensite, bainite, etc. Here's a great reference that should explain this more thouroughly(sp?). http://www.dfoggknives.com/PDF/Houghton_On_Quenching.pdf Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted May 15, 2013 Share Posted May 15, 2013 funny how this guy posts questions, and then does not reply when asked questions about it. :( he just started another thread asking about heat treating. Quote Link to comment Share on other sites More sharing options...
forgemaster Posted May 16, 2013 Share Posted May 16, 2013 I think he was saying that he had quenched in water and had also quenched in oil, not a water oil mixture, I could be excused for thinking english is not his 1st language. Quote Link to comment Share on other sites More sharing options...
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