1Cr12Ni3Mo2VN耐热钢的回火工艺

发布时间：2018-04-20 12:10

  本文选题：耐热钢 + CrNiMoVN　； 参考：《钢铁研究学报》2017年02期

【摘要】：利用金相显微镜、扫描电镜和透射电镜等研究了1Cr12Ni3Mo2VN耐热钢的回火工艺,结果指出试验钢产生第一类回火脆性的主要原因是马氏体板条界存在聚集长大的Fe_3C及M_3C脆性相,导致冲击韧性显著下降。Mo_2C与基体处于共格状态,使基体周围晶格产生很大的静畸变是次要原因;产生第二类回火脆性的原因,一是由于碳化物M_(23)C_6沿原奥氏体晶界和马氏体板条界迅速聚集并粗化,二是板条间残余奥氏体膜因碳贫化而发生热失稳分解。结合技术协议要求,为了有利于组织的稳定性,本试验钢的最佳回火工艺为580℃×2h空冷。
[Abstract]:The tempering process of 1Cr12Ni3Mo2VN heat-resistant steel was studied by means of metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that the main reason for the first type tempering brittleness of test steel is the existence of Fe_3C and M3C brittleness phases in martensite lath boundary. As a result, the impact toughness decreased significantly. Mo2C was in a coherent state with the matrix, resulting in a large static distortion of the lattice around the matrix, and the second kind of tempering brittleness was caused by the second type of tempering brittleness. One is the rapid accumulation and coarsening of carbides M_(23)C_6 along the original austenite grain boundary and martensite lath boundary, and the other is the thermal instability decomposition of the residual austenite film between the lath due to carbon depletion. According to the requirement of technical agreement, the optimum tempering process of this steel is 580 鈩，

本文编号：1777686