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对P92钢在650℃下进行了长达10 000 h的时效试验,并研究了时效过程中P92钢的冲击性能和硬度的变化.结果表明:P92钢具有一定程度的热时效脆化倾向,时效初期脆化速度较快,时效500 h时冲击吸收能量约下降50%,随后放缓并逐渐趋于稳定;根据冲击吸收能量与回火参数之间的变化关系,推出600℃下母材和焊缝金属的时效脆化特性,在整个设计寿命内,虽然母材发生一定程度的时效脆化,但冲击韧性仍然较高;焊缝金属在600℃运行5 000 h时即发生很大程度的脆化,冲击韧性较低;P92钢的硬度随时效时间的增加呈下降趋势,但变化不明显.
The aging test of P92 steel at 650 ℃ for up to 10,000 h was carried out and the impact properties and hardness of P92 steel during aging were studied.The results show that P92 steel has a certain degree of thermal aging embrittlement tendency and aging The initial embrittlement rate was faster, and the impact absorption energy decreased about 50% at 500 h after aging, and then slowed down and gradually stabilized. According to the relationship between impact energy absorbed and tempering parameters, the base metal and welding The aging embrittlement characteristics of the metal throughout the design life, although a certain degree of aging embrittlement of the base metal, but the impact toughness is still high; when the weld metal is running at 600 ℃ 5 000 h occurs a large degree of brittle The impact toughness is lower; the hardness of P92 steel decreases with the increase of aging time, but the change is not obvious.