2.2合金的结晶 Surrounding matrix of y phase 入(cm) 1×104 2X105 1×10-5 80 T T 120 5×105 100 Fe C 600H Fe 80 Fe:C 400 60 FeC→ 40 Fe:C- 200 20 Fe:C- 0 40.000 80.000120,000 1/(cm-) (a) Figure 12-15 Figure 12-12 Growth and structure of pearlit The effect of interlamellar spacing (2) (b)photomicrograph of the pearlite lamellae( on the yield strength of pearlite. ASM International,Materials Park,OH 4407.2.2 合金的结晶 2.2.3 铁碳合金的结晶 (2) 共析钢(eutectoid steel)：W(C)=0.77％ 2、合金的平衡（equilibrium）结晶 ( ) 过程 1 88% 12% 100% 88% 6.69 6.69 0.77 ( ) 3 = − =  = − = w F C w F e 珠光体 Pearlite Fe（F） Fe3C P 抗拉强度 180-230MPa 0 770MPa 断后伸长率 30-50% 0 20-35% 断面收缩率 70-80% 0 / 冲击韧度 1600-200KJ/m2 0 300-400KJ/m2 硬度 50-80HB 800HB 180HB λ