The nearly fully dense valve lifter microstructure has, as a result, all the necessary properties to be carburized and heat treated to achieve physical and mechanical properties previously achieved only in {HEAD ~ forged and wrought steel structures} produced by highly refined processes such as {TAIL ~ vacuum melting} and degassing 
The nearly fully dense valve lifter microstructure has , as a result , all the necessary properties to be carburized and heat treated to achieve physical and mechanical properties previously achieved only in { HEAD ~ forged and wrought steel structures } produced by highly refined processes such as { TAIL ~ vacuum melting } and degassing
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