采用化学定量相分析技术并借助于光学显微镜、XRD、SEM、TEM及常规的力学检测设备,研究了600℃下P92钢中Laves相对强度的影响规律,结果表明：Laves相在时效过程中析出,时效时间在100 h内,Laves相快速形核,1 000 h内,随着时效时间的延长,钢中Laves相含量逐渐增加并能有效提高P92钢室温和600℃高温强度;600℃下3 000 h内提高P92钢中狂钨、钼含量,增加Laves相的析出量,能够显著提高P92钢持久强度。
The effect of Laves phase on strength of P92 steel was investigated with chemical quantitative phase analysis technology and by means of optical microscope,XRD,SEM,TEM and conventional mechanical testing equipment.The results show that Laves phase nucleate at a high rate of speed in the process of ageing 100 h.With the increase of aging time,the content of Laves phase in steel increases gradually and can effectively enhance the room temperature and high temperature strength of P92 steel,improving W,Mo content and increasing the amount of Laves phase precipitation can significantly increase the creep rupture strength of P92 under 600 ℃ within 3 000 h.
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