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为满足面向航空异形空腔薄壁结构件设计要求,并保证构件在高温下仍具有良好的机械性能,采用了激光增材制造方法实现K465高温合金空腔构件成形。分析表明,由于K465合金变形能力差、低熔点共晶相存在,导致成形过程容易出现裂纹,无法通过增材制造实现单一成分K465合金构件成形。通过在成形过程中合理的加入Stellite 6合金,进行去应力处理,并进行基板预热等工艺措施,可以显著减弱甚至消除裂纹。
In order to meet the design requirements of aeronautical shaped thin-walled thin-walled structural parts, and to ensure that the structural members still have good mechanical properties at high temperatures, the laser additive manufacturing method is adopted to form the cavity components of K465 superalloy. The analysis shows that due to the poor deformability of K465 alloy and the existence of low melting point eutectic phase, cracks easily occur in the forming process and the single component K465 alloy component can not be formed by additive manufacturing. Stellite 6 alloy is added into the forming process reasonably, the stress-relieving process is carried out and the preheating of the substrate is carried out to reduce or even eliminate the crack remarkably.