Elongation, which is the opposite of strength, shows an increasing trend with B added, and, similar to other properties, the effect is more pronounced when Mn and Cu are co-added.
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The Effect of Boron (B) and Copper (Cu) on the Microstructure and Graphite Morphology of Spheroidal Graphite Cast Iron.
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The sentences
Tensile strength shows a decreasing trend with B added, and the effect is more significant when Mn and Cu are co-added, as the increased pearlite fraction due to the addition of these elements has a greater influence.