Aging and carburization during the service produced precipitation of carbides, the amount, size and forms of which depended on the service time and working temperature.
炉管服役过程的时效与渗碳导致大量碳化物的析出，其数量、大小与形态取决于服役温度和时间。
There are precipitation strengthening effect during nature aging and low-temperature annealing, however, the conductivity remains stable basically.
材料在自然时效与低温退火过程中，有沉淀强化效应产生，但导电率基本保持稳定。
In addition, discontinuous precipitation often occurs in the later stage during aging, which caused the sharp decrease of many properties including strength and corrosion resistance.
另外，合金时效后期易产生不连续沉淀，导致合金的强度、抗腐蚀性等性能大大降低。
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