5CrNiMo动叶锻模的热处理

Heat Treatment of 5CrNiMo Moving Blade Forging Die

动叶锻模是在高温下通过冲击加压强迫炽热的坯料成为模锻动叶的工具。随着汽轮机制造技术不断发展,动叶型线发生了变化。锻模型腔深度增加,型腔与锻模平面部分区域的变化角度变陡,导致近段时间锻模在动叶模锻时发生了较严重的变形,严重影响锻模使用寿命。经分析,产生上述问题的原因是模具金相组织中存在大量的残余奥氏体。为此,专门对5CrNiMo材料的热处理工艺进行了分析。通过制定合适的工艺,成功解决了残余奥氏体的问题,延长了模具的使用寿命。

Moving blade forging die is at high temperature by shock compression forced hot forging blank become blade tool. With the continuous development of steam turbine manufacture technology, moving blade type line changed. Forging die cavity depth increased, angle of cavity and plane region steeped, resulting in near section time die deformation is more serious in the moving blade forging, seriously affect the service life of forging die. Through analysis, the cause of these problem is the presence of large amounts of residual austenite in mold＇ s microstructure. For this, the 5CrNiMo material heat treatment process are analyzed specially. By making appropriate process, successfully solved the problem of residual austenite, prolong the service life of the die.