Prof. Wenwu Zhang Profile

Prof. Wenwu Zhang

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 11 October 2024 Paper

Effect of defocus amount of rotational beam coupled laser on the grooving characteristics of nickel-based superalloys

Rao Qi, Xiaoxiao Chen, Shunquan Shen, Jianbo Chen, Wenwu Zhang

Proceedings Volume 13287, 1328719 (2024) https://doi.org/10.1117/12.3038999

KEYWORDS: Laser processing, Laser energy, Nanosecond lasers, Laser applications, Scanning electron microscopy, Laser ablation

Read Abstract +

Nickel-based superalloys are widely used in aviation, aerospace, energy, petrochemical and other industrial fields due to their excellent high temperature strength, oxidation and corrosion resistance, excellent creep and fatigue resistance. However, there are many problems in the traditional processing methods, such as tool wear, thermal/mechanical damage of materials and so on. These problems limit the processing ability of micro structures and complex surfaces, making it difficult to process nickel-based superalloy components with high quality. Laser processing has the advantages of high precision, non-contact and green, which has become an effective means of nickel-based superalloy surface processing. In this paper, a new process of rotational multi-beam coupled nanosecond laser processing was used to study the groove cutting of nickel-based superalloy with variable defocus amount. The morphology and structure of the groove were observed and analyzed by laser confocal microscope and scanning electron microscope. The results show that the groove width is the smallest and the groove depth is larger when the defocus amount is -1.0mm, and the laser energy density is larger when the defocus amount is close to -1.0mm, and a relatively high adhesion layer is formed between the groove edge and the unmachined surface. By analyzing the groove straightness under different defocus amounts, the groove straightness first decreases and then increases, and the straightness is the smallest at -1.0mm, indicating that -1.0mm defocus position is a relatively suitable processing position. The research work can provide process guidance for the laser processing application of nickel-based superalloys.

Proceedings Article | 16 October 2023 Paper

Accumulative effect in femtosecond laser ablation of SiCf/SiC ceramic matrix composites

Qi Rao, Xiaoxiao Chen, Tao Chen, Jianbo Chen, Wenwu Zhang

Proceedings Volume 12792, 127920V (2023) https://doi.org/10.1117/12.2691145

KEYWORDS: Laser ablation, Laser damage threshold, Laser processing, Composites

Read Abstract +

Silicon carbide fiber reinforced silicon carbide ceramic matrix composites (CMC-SiC_f/SiC) have been widely used in aerospace and other fields due to their excellent properties such as high hardness, oxidation resistance and high temperature resistance. Different from the traditional machining methods, laser processing technology has great application prospects in CMC-SiC_f/SiC. In this paper, the single-pulse ablation test and multi-pulse cumulative ablation test of CMC-SiC_f/SiC were carried out by femtosecond laser at different powers with a wavelength of 1035 nm. A series of experiments were designed to process the ablation pits on the material surface. The diameter of the ablation pits was observed by laser confocal microscope. The variations of the ablation threshold of CMC-SiC_f/SiC surface under different pulse energies and pulse numbers were studied. The results show that the multi-pulse ablation threshold of CMC-SiC_f/SiC decreases with the increase of pulse number, and there is a significant cumulative effect. The multi-pulse ablation threshold of CMC-SiC_f/SiC is mainly related to the number of pulses, which is determined by two parameters: accumulation factor and single-pulse ablation threshold. The single-pulse ablation threshold of CMC-SiC_f/SiC is 1.1914 J/cm², and the accumulation factor is 0.6245. In femtosecond laser processing, the pulse accumulation effect has a significant influence on the ablation of hard and brittle material CMC-SiC_f/SiC. This study can provide technical guidance for process optimization.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years