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六、金属材料组织对断裂韧性 K_(IC)的影响(一)金属材料中各种组织对断裂韧性 K_(Ic)的影响1.马氏体组织结构对 K(IC)的影响根据组织结构及形态,马氏体分为片状马氏体和板条马氏体两大类。片状马氏体由于含碳量高,生成速度快,在巨大相变冲击力作用下易于出现微裂纹,其长度可达10微米。它主要由孪晶构成,在外力作用下孪晶容易出现空洞的生核、长大和聚合。板条马氏体转变的金
Sixth, the impact of metal materials on the fracture toughness K_ (IC) (A) of the various materials in the metal fracture toughness K_ (Ic) 1. Martensitic structure of the K (IC) According to the organizational structure and Form, martensite is divided into lamellar martensite and lath martensite two categories. Flaky martensite due to the high carbon content, the formation rate is fast, prone to micro-cracks under the effect of a huge phase change impact, the length of up to 10 microns. It is mainly composed of twins, twins are prone to nucleation, growth and polymerization under the action of external force. Lath martensitic transformation of the gold