结合理论分析认为：硅元素分布微观不均匀性导致了自旋玻璃出现，而自旋玻璃是宽温区负热膨胀行为的内在原因。
After theoretical analysis, it is concluded that spin-glass which results from the hyperdispersion of si at micro scale is the reason for the broadening of the NTE operation-temperature window.
结果表明：回火索氏体是最佳的组织形态；微观硬度的不均匀性显著影响钢的表面加工质量。
The results indicated that the tempered sorbite was the optimum microstructure, the inhomogeneous distribution of micro hardness affected markedly the finish quality of the steel surface.
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