各样品的衍射效率随锰量的增加先减少后增加；
With the increase of Mn doping amount, the diffraction efficiency firstly decreased and then increased;
随渗剂中高碳铬铁含量的增加，表面复合材料的磨损率先减少后增加；
The wear rate of composites decreases firstly and increases subsequently with the increase of the content of high carbon chromium iron.
室温和高温拉伸强度随锻造火次的增加呈现先减少后增加的趋势，塑性则先增加后减小。
At room temperature and high temperature the tensile strength of the forging decreases firstly and then increases while the ductility changes on the contrary.
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