Effect of Hot Isostatic Pressing on Fatigue Properties of Laser Melting Deposited AerMet100 Steel

• Published in: Journal of iron and steel research, international Vol. 20; no. 11; pp. 79 - 84
• Main Authors: CHENG, Hao, LIU, Dong, TANG, Hai-bo, ZHANG, Shu-quan, RAN, Xian-zhe, WANG, Hua-ming
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.11.2013; Springer Singapore
• Subjects: AerMet100 steel; Alloys; Applied and Technical Physics; Defects; Engineering; Fatigue (materials); High alloy steels; High strength steels; high-cycle fatigue; HIP处理; Hot isostatic pressing; Iron and steel industry; Laser beam melting; laser melting deposition; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; metallurgical defect; Metallurgy; Physical Chemistry; Processes; Structural steels; 冶金缺陷; 激光; 热等静压; 熔化沉积; 熔敷; 超高强度钢; 高周疲劳性能; hot isostatic pressing; high-cycle fatigue; metallurgical defect; AerMet100 steel; laser melting deposition
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(13)60200-9

The ultra-high strength steel AerMetl00 was fabricated .by laser melting deposition （LMD） process. The effect of hot isostatic pressing （HIP） on high-cycle fatigue properties of the LMD AerMet100 steel was investigated, and the influence of defects on fatigue behavior was discussed. Results showed that the LMD AerMetl00 steel had fine directionally solidified cellular dendrite structure and coarse columnar prior austenite grains. Metallurgical de fects such as gas pore and lack-of-fusion porosity were produced during the laser deposition process. After HIP treat- ment, the number and size of metallurgical defects had remarkably decreased. Moreover, high-cycle fatigue proper ties of the alloys after HIP treatment were superior to the as-deposited alloys.