It is common practice to specify the \"case depth\" as the depth from the surfac

Question

It is common practice to specify the "case depth" as the depth from the surface at which the hardness achieves a Rockwell C value of 50 after carburizing. The measurements are made with a microhardness tester. For this problem completely specify how you would achieve a lmm case depth on an AISI 1020 steel by (a) pack carburizing at 930°C and (b) by gas carburizing at 930°C in a CO/CO2 atmosphere which is adjusted to insure a surface composition of 1 .0 wt.% C. Which process do you think is most advantageous? De= 0.12 exp[-133,888/RT] cm2/s

Explanation / Answer

1) For gas carburizing surface carbon contains and case depth can controlled accurately.

2) For pack carburizing, it is difficult to control surface carbon and case depth. If we won't able to control the amount of carbon that we are going to endure in that metal, then it can be lead to increase or decrease in case depth. This happens mainly due to packing of charcoal over the metal surface.

SO I WILL GO VIA GAS CARBURIZING METHOD INSTEAD OF PACK CARBURIZING. IN TERMS OF LESS COST PACK IS COST EFFICIENT BUT STILL GAS IS ACCURATE.

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