一、晶粒细化与提高金属、合金性能的关系生产实践与科学试验表明,晶界状况对金属与合金性能影响很大。铸铁(尤其是铸钢)的质量不仅要求化学成分合格,且要求非金属夹杂物尽可能要少。因它在合金中所占体积虽小,但对性能影响大。以轴承钢为例,由于它要承受很高的接触疲劳抗力,因此要严格控制 First, the grain refinement and improve the relationship between metal and alloy performance Production practice and scientific experiments show that the grain boundary conditions on the performance of metals and alloys greatly affected. The quality of cast iron, especially cast steel, requires not only acceptable chemical composition but also requires less non-metallic inclusions. Because of its small size in the alloy, but the performance of large. Bearing steel, for example, because it has to withstand high contact fatigue resistance, so to be strictly controlled