Inconel 690合金高温低塑性裂纹敏感性研究

Study on ductility dip cracking sensitivity for Inconel 690 alloy

镍基合金具有良好的高温力学性能以及优异的抗腐蚀能力,常用于核电设备的关键部件。但是应用中发现该合金具有一定的高温低塑性裂纹倾向,而高温低塑性裂纹的存在,将导致关键部件的焊接结构在服役时存在极大的安全隐患。针对上述问题,选用Inconel 690焊带熔敷金属,采用STF方法研究该材料的低塑性开裂的温度区间以及高温下的应变门槛值,探索镍基高温合金的高温低塑性裂纹产生的机理。

Ni-based high-temperature ally have excellent high temperature mechanical properties and corrosion resista-nce,which are often used in nuclear power equipment.However,recent studies have found that this kind of material has obvious ductility dip cracking tendency,which will lead to the existence of great security risk of the key components in service.Aiming at this problem,this paper selects Inconel 690 welding deposited metal,Using STF method to explore the ductility dip cracking temperature range and high temperature strain threshold value,further reveals themechanism of ductility dip cracking of Ni-based high-temperature ally.