scholarly journals Effect of solution heat treatment on creep properties of a nickel-based single crystal superalloy

2021 ◽  
Author(s):  
Yunling Du ◽  
Yanhong Yang ◽  
Aimin Diao ◽  
Yongmei Li ◽  
Xinguang Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Solution Heat Treatment ◽  
Single Crystal Superalloy ◽  
Creep Properties

Investigation on a ramp solution heat treatment for a third generation nickel-based single crystal superalloy

2017 ◽  
Vol 723 ◽  
pp. 922-929 ◽  
Author(s):  
Yanbin Zhang ◽  
Lin Liu ◽  
Taiwen Huang ◽  
Quanzhao Yue ◽  
Dejian Sun ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Solution Heat Treatment ◽  
Single Crystal Superalloy ◽  
Third Generation

LCF, HCF and VHCF life sensitivity to solution heat treatment of a third-generation Ni-based single crystal superalloy

2020 ◽  
Vol 130 ◽  
pp. 105247 ◽  
Author(s):  
Luciana Maria Bortoluci Ormastroni ◽  
Lorena Mataveli Suave ◽  
Alice Cervellon ◽  
Patrick Villechaise ◽  
Jonathan Cormier
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Solution Heat Treatment ◽  
Single Crystal Superalloy ◽  
Third Generation

Microstructures of Low Angle Boundaries of a Third Generation Single Crystal Superalloy DD9

2017 ◽  
Vol 898 ◽  
pp. 413-421
Author(s):  
Wan Peng Yang ◽  
Jia Rong Li ◽  
Shi Zhong Liu ◽  
Jin Qian Zhao ◽  
Zhen Xue Shi ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Grain Boundaries ◽  
Solution Heat Treatment ◽  
Discrete Distribution ◽  
Single Crystal Superalloy ◽  
Third Generation ◽  
Cast State ◽  
Aging Heat Treatment ◽  
Treatment Processes

The microstructures of low angle boundaries (LABs) of a third generation single crystal superalloy DD9 in as-cast state and after different heat treatment processes were studied by optical microscopy (OM) and field emission scanning electron microscopy (FESEM). The results showed that the as-cast LABs of DD9 alloy consisted of rod-like and bulk γ' phases with γ matrix between them, and there were eutectic γ-γ' precipitating at the LABs, as well as small amounts of discrete distribution of carbides. The γ' phase locateed at the grain boundaries was larger than that distributed on both sides of the grain boundaries. After the solution heat treatment, as-cast eutectic γ-γ' at LABs dissolved completely, and rod-like γ' phase was still found at some LABs. Meanwhile, the LABs were inclined to be straight compared to the as-cast state. The primary aging heat treatment made γ' phase at the LABs dissolved completely, and the secondary aging heat treatment resulted little change in the morphology of the LABs. Thus, the effect of the primary aging heat treatment on the microstructures of the LABs was greater than that of the secondary aging heat treatment.

scholarly journals Creep Damage Repair of a Nickel-Based Single Crystal Superalloy Based on Heat Treatment

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 623
Author(s):  
Xiaoyan Wang ◽  
Meng Li ◽  
Yuansheng Wang ◽  
Chengjiang Zhang ◽  
Zhixun Wen
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Creep Damage ◽  
Primary Creep ◽  
Single Crystal Superalloy ◽  
Secondary Creep ◽  
Creep Life ◽  
Phase Coarsening ◽  
Damage Repair ◽  
Creep Time

Taking nickel-based single crystal superalloy DD6 as the research object, different degrees of creep damage were prefabricated by creep interruption tests, and then the creep damage was repaired by the restoration heat treatment system of solid solution heat treatment and two-stage aging heat treatment. The results show that with the creep time increasing, the alloy underwent microstructure evolution including γ′ phase coarsening, N-type rafting and de-rafting. After the restoration heat treatment, the coarse rafted γ′ phase of creep damaged specimens dissolved, precipitated, grew up, and became cubic again. Except for the specimens with creep interruption of 100 h, the γ′ phase can basically achieve the same arrangement as the γ′ phase of the original sample. The comparison of the secondary creep test shows that the steady-state creep stage of the test piece after the restoration heat treatment is relatively increased, and the total creep life can reach the same level as the primary creep life. The high temperature creep properties of the tested alloy are basically recovered, and the restoration heat treatment effect is good.

scholarly journals Effect of long-term thermal exposure on microstructure and creep properties of DD5 single crystal superalloy

China Foundry ◽  
2021 ◽  
Vol 18 (3) ◽  
pp. 185-191
Author(s):  
Xu-dong Wang ◽  
Zhong Yang ◽  
Qiang Gao ◽  
Li-rong Liu
Keyword(s):  
Single Crystal ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Creep Properties

Creep Behavior of a 4.5% Re Nickel-Base Single Crystal Superalloy at High Temperature

2015 ◽  
Vol 750 ◽  
pp. 139-144 ◽  
Author(s):  
De Long Shu ◽  
Su Gui Tian ◽  
Xin Ding ◽  
Jing Wu ◽  
Qiu Yang Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Single Crystal ◽  
Deformation Mechanism ◽  
Creep Property ◽  
Single Crystal Superalloy ◽  
Micro Cracks ◽  
Initiation And Propagation ◽  
Temperature Ranges ◽  
Nickel Base

By means of heat treatment and creep property measurement, an investigation has made into the creep behaviors of a containing 4.5% Re nickel-base single crystal superalloy at high temperature. Results show that the elements W, Mo and Re are enriched in the dendrite arm regions, the elements Al, Ta, Cr and Co are enriched in the inter-dendrite region, and the segregation extent of the elements may be obviously reduced by means of heat treatment at high temperature. In the temperature ranges of 1070--1100 °C, the 4.5% Re single crystal nickel-based superallloy displays a better creep resistance and longer creep life. The deformation mechanism of the alloy during steady state creep is dislocations slipping in the γ matrix and climbing over the rafted γ′ phase. In the later stage of creep, the deformation mechanism of alloy is dislocations slipping in the γ matrix, and shearing into the rafted γ′ phase, which may promote the initiation and propagation of the micro-cracks at the interfaces of γ/γ′ phases up to the occurrence of creep fracture.

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