A knife-wielding woman slashed another female commuter as tensions flared during the Thursday morning commute in downtown Brooklyn — and then turned herself in a short time later, cops said.

The victim, 44, had just gotten off an R train at the Jay Street-MetroTech station around 9:40 a.m. when she and Jahlayah Blondel, 26, got into a heated argument, according to authorities and sources.

The clash turned violent when Blondel — a stranger to the victim — allegedly pulled out the blade and cut her on the left shoulder, police said.

The victim was taken to NYU Langone Health—Cobble Hill with minor injuries, cops said.

Blondel, of Staten Island…

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