选区激光熔化 <strong><i>γ'</i></strong> 相强化镍基高温合金裂纹形成机理与抗裂纹设计研究进展

选区激光熔化 γ' 相强化镍基高温合金裂纹形成机理与抗裂纹设计研究进展

祝国梁, 孔德成, 周文哲, 贺戬, 董安平, 疏达, 孙宝德

Research Progress on the Crack Formation Mechanism and Cracking-Free Design of γ' Phase Strengthened Nickel-Based Superalloys Fabricated by Selective Laser Melting

ZHU Guoliang, KONG Decheng, ZHOU Wenzhe, HE Jian, DONG Anping, SHU Da, SUN Baode

图7 连续波和脉冲波模式下同一点(P2)的温度分布、冷却速率与时间的关系，以及连续波模式和脉冲波模型下制造的IN738LC合金的缺陷^[57]

Fig.7 Calculated thermal history (temperature profiles, heating and cooling rates) versus time of the same point under the continuous-wave (a) and pulsed-wave modes (b), and the defect of the selective laser melted IN738LC alloys fabricated under the continuous-wave (c) and pulsed-wave mode (d)^[57] (T_max is the maximum temperature of the molten pool, ${\frac{d T}{d t}|}_{m i n}$ is minimum cooling rate)