In the carburizing of 1018 steel... The carbon concentration will be equal to or greater than...

In the carburizing of 1018 steel...

		The carbon concentration will be equal to or greater than 18% by wt 2mm below the surface after 24 hours at 500C.
		The carbon concentration will be equal to or less than 0.18% by wt 2mm below the surface after 24 hours at 500C.
		The carbon concentration will be equal to or less than 18% by wt 2mm below the surface after 24 hours at 500C.
		The carbon concentration will be equal to or greater than 0.18% by wt 2mm below the surface after 24 hours at 500C. The carbon concentration will be equal to or greater than 18% by wt 2mm below the surface after 24 hours at 500C.

Expert Solution

Carburizing is a type of case hardening process which is applicable to low carbon steel component (L.C.S ) .

In carburizing process surface layer of low carbon steel is enriched with carbon to produce hard case . It is achieved by incorporating carbon atoms onto envelope of L.C.S component .Due to this it will turn hard by forming Fe₃C . By heating component at high temperatures CO ( carbon monoxide ) gas is circulated in envelope . At such temperature CO will break into carbon and oxygen where carbon will penetrate into component and oxygen goes out . Due to continuos penetration of carbon atom , outer envelope will be produced with more iron carbide ( Fe₃C ) and turns hard .

Case depth achieved = 0.5 mm/ 5 hour = 2.3 mm / 24 hour ( general data )

Coming to question it is now clear that carbon content will be low .

Now 1018 steel is L.C.S that contains carbon percentage from 0.15% - 0.20% .

So in order to decide that carbon content will be more or less than 0.18 % we have to think about need of carburizing and answer comes that it is done to achieve hardness . So we now have to find when hardening achieved will be more .

If carbon content is low in component then penetration of external carbon atoms will be easy means more depth can be achieved . Hence we came to conclusion that carbon content should be less than or equal to 0.18 % .

In carburizing of 1018 steel the carbon concentration will be equal to or less than 0.18% by wt 2mm below the surface after 24 hours at 500 C.

samet mamat answered 2 years ago

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