I recommend to use the titlesec
package. Here's an example:
\usepackage{titlesec}
\titleformat{\chapter}[display]
{\normalfont\huge\bfseries\centering}
{\chaptertitlename\ \thechapter}{20pt}{\Huge}
This is similar to the standard chapter plus \centering
.
I prefer sans serif headings, because I think bold headings with serifs are too heavy. Hoewver, serifs are great for body text. Recently I used this:
\usepackage{titlesec}
\titleformat{\chapter}[display]
{\normalfont\sffamily\Large\bfseries\centering}
{\chaptertitlename\ \thechapter}{0pt}{\Huge}
\titleformat{\section}
{\normalfont\sffamily\large\bfseries\centering}
{\thesection}{1em}{}
\titlespacing*{\chapter}{0pt}{30pt}{20pt}
To get:
Also because of the lighter appearance of those bold headings, KOMA-Script classes use sans-serif headings by default.