@article{article, title  = {{Optimization of friction welding process parameters for 42Cr9Si2 hollow head and sodium filled engine valve and valve performance evaluation}},

 publisher = {{MPDI}},

 url = {{https://eprints.whiterose.ac.uk/id/eprint/144615 }},

 year = {{2019}},

 month = {{4}},

 author = {{Lai F and Qu S and Lewis R and Slatter T and Sun G and Zhang T and Li X}},

 doi = {{10.3390/ma12071123}},

 volume = {{12}},

 journal = {{Materials}},

 issue = {{7}},

 note = {{Accessed on 2025/11/22}}}