TT处理对690合金传热管显微组织和性能的影响

发布时间：2018-05-28 20:54

  本文选题：合金传热管 + 特殊热处理　； 参考：《热加工工艺》2017年22期

【摘要】：对核电站蒸汽发生器用690合金传热管进行不同保温时间的特殊热处理,研究保温时间对690合金传热管显微组织、拉伸性能和晶间腐蚀性能的影响。研究结果表明:经10~30 h的特殊热处理后,690合金传热管晶界均分布连续或半连续的碳化物,且晶内分布极少量的碳化物和大量的孪晶;随着保温时间的增加,碳化物有粗化的现象,室温及350℃拉伸性能变化不大,拉伸性能缓慢增加,350℃的抗拉强度仍能保持在600 MPa以上;随着特殊热处理保温时间的增加,690合金传热管晶间腐蚀速率未发生明显变化,且均不超过13 mdd(毫克/平方分米·天)。
[Abstract]:Special heat treatment of 690 alloy heat transfer tube used in steam generator of nuclear power plant was carried out. The effect of holding time on microstructure, tensile property and intergranular corrosion of 690 alloy heat transfer tube was studied. The results show that after special heat treatment for 10 ~ 30 h, continuous or semi-continuous carbides are distributed in the grain boundaries of the heat transfer tubes, and a very small amount of carbides and a large number of twins are distributed in the grains, and with the increase of the holding time, The carbides have coarsening phenomenon, the tensile properties at room temperature and 350 鈩，

本文编号：1948156