Because I try to keep my chapters around 1,000 words two or three chapters might be a continuation of what's happening. For myself I find it awkward to have "parts" to chapters. They kind of leave a little itch between the shoulder blades. So I don't title my chapters.
Also, I'm not that fond of title chapters in general so I don't go there. Besides, I'm title-challenged enough trying to find a good title for the book let along 60 or 90 chapters! LOL. Kudos to those who can do it.
Write hard, write true