本文研究了20Cr钢中魏氏组织形成规律,无论是粗大或细小的奥氏体晶粒,只要冷却速度适宜都可以产生魏氏体晶粒,这说明魏氏组织不是过热的标志。也探讨了魏氏组织对钢的机械性能的影响,认为在相同奥氏体晶粒下有魏氏组织的试样综合机械性能优于退火状态试样,尤其在低温冲击韧性方面更为显著。 In this paper, we study the formation regularity of Wei’s tissue in 20Cr steel, whether coarse or small austenite grains, as long as the cooling rate is suitable for the production of Wenstein grains, indicating that the Weissenian tissue is not a sign of overheating. The effect of Widmanstatten on the mechanical properties of steel was also discussed. The results show that the mechanical properties of Widmanstatten samples with the same austenite grain size are better than that of annealed samples, especially at low temperature impact toughness.