| The matrix microstructures resulting from heat treatment can vary from ferrite-pearlite to tempered martensite. |
| The martensite of quenched tool steel is exceedingly brittle and highly stressed. |
| The presence of a thin layer of untempered martensite on top of the cold-worked surface was indicative of overheating and cooling. |
| If the alloy is quenched from a high temperature to form martensite, it will be hard, brittle, and virtually impossible to machine. |
| Dual-phase steels, which feature hard martensite particles in a soft ductile ferrite matrix are also highly formable. |
| Trip steels have a microstructure with retained austenite, ferrite and martensite. |
