Generally, smaller grain size producing harder material
which means higher microhardness and more brittle structure.
you can take a look on this research it may give you a good impression about the subject you released
https://d1wqtxts1xzle7.cloudfront.net/46194077/AFRINNNNN.pdf?1464949166=&response-content-disposition=inline%3B+filename%3DMicrostructure_and_tensile_properties_of.pdf&Expires=1598803309&Signature=fC5K1sEvHAwu6DJYldm7EjdiaKxkLyMXgHCCx13jV6Ar0Y6DIKw-NLJyr5gXMyHORsvRBwokgYsXexleQ-kUN6vHy6aZ-Y6vMLfs00XOoL3T~jCo~9x9DCzjp4vPmX-csGhQRXzdVxVbXufqAa3~X2BCS-i-xDMTd0rgudEbrmU95EMVI0tq9-X64asO1BZa-wN96WFvsnmZzsF7towhGFoyUFU0nD8UC4n0hXKciu0Fy7uCHQFKLlG7Husinvo5D9k-gqRbR~wd5O-f7JC1of~IE6DCdvOVlP6hYbENh8VuieccZU-iVhLAqGyijwxNGcFGFp0spSdFdW3eI-aTpA__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA
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