Pengaruh Media Pendingin Pada Proses Hardening Terhadap Strukturmikro Baja Mangan Hadfield AISI 3401 PT Semen Gresik

Mohammad Ismanhadi Syahputra, Yuli Setiyorini
Submission Date: 2013-07-23 13:25:05
Accepted Date: 2013-09-01 00:00:00

Abstract


Baja Mangan Hadfield termasuk dalam kategori baja mangan austenitic dengan kandungan Mn (mangan) yang tinggi, antara 12-14% Mn dan 0.8-1.25% C. Baja mangan hadfield memiliki kekerasan, kekuatan, ketangguhan, serta ketahanan terhadap aus yang tinggi. Proses hardening diberikan dengan melakukan pendinginan yang relatif cepat dengan menggunakan media pendingin air, oli, polivinylalcohol 10%, dan polyvinylalcohol 40% bertujuan untuk mendapatkan nilai kekerasan yang lebih tinggi yakni dengan pendinginan air 275VHN sedangkan tanpa perlakuan 206VHN. Viskositas dari media pendingin yang berbeda-beda berpengaruh terhadap laju pendinginan pada baja mangan hadifield.. Jenis media pendingin yang bervariasi mempengaruhi perubahan austenit menjadi martensit.  Strukturmikro yang terbentuk pada baja mangan hadfield yang mengalami proses hardening tampak butir-butir kristal yang seluruhnya martensit, sedangkan pada baja mangan hadfield yang tanpa mendapatkan perlakuan tampak karbida mangan lamellar dengan matriks austenit.


Keywords


austenitic; fasa; matriks

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