The　purpose　of　this　research　was　to　clarify　wear-related　interactions　between　the　M2B　phase　and　the　metallic　matrix　in　an　Fe-3.0　wt　%　B　duplex　alloy,　and　to　characterize　those　effects　on　two-body　abrasive　wear　by　establishing　a　mathematical　model.　Furthermore,　the　effects　of　1.0–2.5　wt　%　Cr　additions　on　the　two-body　abrasive　wear　of　the　alloy　against　silica　sand　paper　are　discussed　in　detail.　Results　of　this　investigation　show　that　matrix/second　phase　microstructural　interactions　significantly　decrease　the　wear　of　Fe-3.0　wt　%　B　alloy.　By　comparison,　M2B　plays　a　predominant　role　in　improving　the　alloy＇s　wear　interaction,　while　the　metallic　matrix　is　detrimental　to　it.　The　trend　resulting　from　chromium　additions　is　analogous　to　the　effects　of　the　fracture　toughness　of　M2B,　and　chromium　additions　also　contribute　to　wear　resistance.　Improving　the　fracture　toughness　of　M2B　not　only　decreases　the　wear　directly　but　it　also　enhances　the　matrix/second　phase　wear　interactions,　which　in　turn　improve　the　wear　resistance　of　Fe-3.0　wt　%　B　duplex　alloy.　©　2019　Elsevier　B.V.