Per: ISADORA PEREIRA NUNES (UFOP UNIV FED. DE OURO PRETO -), Geraldo lúcio de faria (UFOP UNIV FED. DE OURO PRETO), josé carlos de lacerda (unifei univ. fed. de itajubá ), leonardo barbosa godefroid (UFOP UNIV FED. DE OURO PRETO)
Abstract:
UNS S41003 (410D) steel is a non-stabilized ferritic stainless steel with relatively low chromium content. It has superior mechanical and corrosion resistance than low carbon steels. For this reason, and because of its relatively low cost in special steels, it is a strong candidate for replacement of common carbon steels in a variety of applications. In addition to satisfactory chemical properties, it is important to ensure good performance in relation to its mechanical strength to stipulate new applications of this steel, thus, the development of hardening mechanisms without significant loss of ductility is desirable. In this context, this work evaluated the influence of quenching with intercritical austenitization on the microstructure and mechanical properties of 410D ferritic stainless steel. Heat treatments of quenching were carried out by varying the temperature and the time of austenitization in order to obtain biphasic microstructures (ferrite and martensite). The results showed that the increase of the temperature and the time of austenitization favors the increase of the martensite fraction in the microstructure and the higher the martensite fraction, the higher the hardness and the tensile strength. The best balance between mechanical strength gain, without significant loss of ductility was presented by steel containing 57% martensite.