利用日产Ｆｏｒｍａｓｔｏｒ－Ｄｉｇｉｔａｌ全自动相变记录仪模拟堆焊热循环条件，测定了堆焊层金属ＣＣＴ图，并对其转变组织和性能进行了研究。结果表明：堆焊金属具有非常高的淬透性和淬硬性；其Ａ→Ｐ被强烈推迟而难以发生，Ａ→Ｂ被显著推迟，临界淬火冷却速度约为３００℃／ｍｉｎ。在堆焊热循环条件下，金属的组织转变存在严重的不均匀性，冷却速度稍慢时，有碳化物析出并呈偏聚状态分布 The Nissan Formastor-Digital automatic phase change recorder was used to simulate the thermal cycling conditions of the surfacing, and the CCT of the overlay metal was measured. The microstructure and properties of the overlay were studied. The results show that the deposited metal has a very high degree of hardenability and hardenability. The A → P is strongly delayed and difficult to occur. The A → B is significantly delayed, and the critical quenching and cooling rate is about 300 ℃ / min. Under the conditions of surfacing thermal cycling, there is serious inhomogeneity in the microstructure transformation of the metal. When the cooling rate is slower, carbides are precipitated and are distributed in a segregation state