harden ability造句

• Abstract : the structure and the properties of the grinding ball made of the composite cast iron have been researched in this paper . the result indicates that added trace boron and a proper quantity copper to this kind of composite cast iron can increase its quench - hardening ability , and raise its hardness and impact toughness
  文摘:研究了一种复合铸铁磨球的组织和性能，结果表明，化学成分和淬火工艺对这种复合铸铁磨球的组织和性能有很大影响，微量的硼和适量的铜可以明显地提高磨球的淬透性，经过余热淬火得到贝氏体或马氏体基体组织，从而提高磨球的硬度和冲击韧性。