二次碳化物（proeutectoid carbide），是指高于共析成分的奥氏体，在高温冷却之际，发生共析转变之前析出的碳化物。广义则包括过冷奥氏体在形成珠光体(广义的珠光体)之前析出的碳化物。
选用三种不同碳、铬含量的耐磨钢，通过热处理获得不同数量的二次碳化物和马氏体基体。
The effects of varying the amount of secondary carbide on the character of matrix under three-body abrasion of wear resistant steel have been investigated.
退火过程中析出的二次碳化物阻碍再结晶晶界的迁移，从而影响再结晶层的界面推移速率。
The secondary carbides have a strong influence on recrystallization rate by retarding the migration of recrystallization grain boundaries.
WC原始颗粒以各种复式碳化物的形式析出，分别形成枝状或鱼骨状共晶碳化物、网状二次碳化物及大块状碳化物。
Multiple carbides are precipitated from WC particles, which form many different shapes such as dendrite or fishbone eutectic carbide, reticulation secondary carbide and conglomeration carbide.
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