In-situ measurement and control of the tool-workpiece interface temperature during friction stir processing of 304/304L stainless steel
Journal Article
·
· Materials Today Communications
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); City Univ. of Hong Kong, Kowloon (Hong Kong)
Friction stir processing of 304/304L stainless steel is an area of interest for repair of spent nuclear fuel canisters. To enable repair without canister deflection or fracture, it is necessary to define the limitations for the depth of the processing zone which will be critically dependent on the thermal history of the material. Here, this work provides the first direct measurement of the interface temperature for friction stir processing of steel. The measured temperature is in the range of 850–1050 °C which is 20–30 % higher than previously reported values. Notably, the peak temperature occurs at the pin tip which is attributed to a higher sticking fraction and subsequently higher strain rate near the tool axis of rotation. Furthermore, a clear correlation between the temperature, grain size, and hardness is established within a single weld nugget and across different processing conditions. In the future, this data may lead to improved process modelling through direct validation and allow for property optimization through direct microstructure control.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2340117
- Report Number(s):
- PNNL-SA--188434
- Journal Information:
- Materials Today Communications, Journal Name: Materials Today Communications Vol. 38; ISSN 2352-4928
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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