But with same austenitizing temperature, strength and impact toughness of steel increase with decreasing the austenite grain size, while ductility decreases as austenite grain size decreases.

• 在相同的奥氏体化温度下，强度随着晶粒的细化而上升。在整个研究范围内，随着晶粒的细化，实验钢的韧性有一定的提高，塑性略有下降。