EFFECTS OF RARE EARTH ELEMENTS ON MICROSTRUCTURAL TRANSFORMATION OF LOW OR MEDIUM CARBON Si-Mn-V STEELS DURING QUENCHING AND TEMPERING
WANG Xiaotian;YAO Yinliang;SHAO Tanhua Xi'an Jiaotong University
Cite this article:
WANG Xiaotian;YAO Yinliang;SHAO Tanhua Xi'an Jiaotong University. EFFECTS OF RARE EARTH ELEMENTS ON MICROSTRUCTURAL TRANSFORMATION OF LOW OR MEDIUM CARBON Si-Mn-V STEELS DURING QUENCHING AND TEMPERING. Acta Metall Sin, 1990, 26(6): 40-45.
Abstract The microstructural transformation of four different low or mediumcarbon steels: 20SiMn2V, 20SiMn2VRE, 40SiMn2V and 40SiMn2VRE, during quen-ching and tempering have been examined by TEM, X--ray diffraction and dilatometer.It was shown that the rare earth elements added may make not only the fine aus-tenite grains of the low or medium carbon steels, but also the fine packet of lathmartensite and lath size, lower the M_s temperature and raise the relative Percenta-ge of dislocation substructure of martensite in medium carbon steel, but influenceno more the volume fraction and thermal stability of retained austenite within que-nching and tempering structure of low or medium carbon steels. The rare earthelements may remarkably inhibit the decomposition of low carbon martensite duringlow temperature tempering, retard the precipitation of cementite plates in lath gra-ins and delay the spheroidization of carbides. They may also restrain obviously theprecipitation and spheroidization of cementite in medium carbon martensite duringhigh temperature tempering.
