Two steels are being considered for manufacture of as- forged connecting rods. one is aisi 4340 cr-mo-ni steel capable of being heat-treated to a tensile strength of 1790 mpa. the other is a plain carbon steel aisi 1040 with an attainable sut of 778 mpa. if each rod is to have a size giving an equivalent diameter de of 19 mm, is there any advantage to using the alloy steel for this fatigue application?

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