摘要
This study presents a design strategy to enhance the high-temperature creep resistance of Ni-based superalloys.This strategy focuses on two principles:(1)minimizing the dimensions ofγ/γ′interfaces andγchannels by reducing the size of theγ′phase;(2)key alloy composition control to strengthen the heterostructureγ/γ′interfaces.This strategy proved very effective by the designed three superalloys'prolonged creep lives.An alloy exhibits ultra-long creep life by 388 h at 1100°C/137 MPa,which runs at the highest level among those alloys without Ru addition.With Ru addition,an alloy that lasted for 748 h with a creep strain of~6%at 1110°C/137 MPa is developed.This study provides a new route of high-temperature creep lives through heterostructure interfacial design with size effects and key alloying elements.
基金
supported by the National Key Research and Development Program of China(2021YFA1200201)
the Natural Science Foundation of China(91860202,51988101,52171001,52071003 and 52001297)
the R&D Program of Beijing Municipal Education Commission(KM202210005003)
the Beijing Outstanding Young Scientists Projects(BJJWZYJH01201910005018)
the Beijing Nova Program(Z211100002121170)
the Overseas Expertise Introduction Project for Discipline Innovation(“111”project)(DB18015)
