Investigation of Preparation and Property of ODS HT9 Steel

An ODS(oxide dispersion strengthened) steel power with HT9 power of nitrogen atomization and Y₂O3 power was prepared by mechanically milling, and ODS HT9 steel with different sintering temperature was prepared by SPS(Spark plasma sintering). ODS steel power characteristics with different ball-milling technology (ball-milling time and ball-to-powder ratio)and ODS HT9 steel property with different sintering temperature were investigated by optical microscope, XRD, SEM, vickers and tensile testing instrument. The results show that the alloy power with particle size distribution and stable of grain size are prepared after milling 30 hours and BPR 10:1.Ferrite-Martensite phase is only existed of ODS HT9 steel in 1 000 ℃and 1 050 ℃.The ultimate tensile strength, relative density, hardness of ODS steel with sintering temperature 1 000 ℃ are 955 MPa, 98.6% and 460HV1, respectively. It owns better property than ordinary 316 stainless steel of similar composition, and the ultimate tensile strength and hardness increased by 48% and 52%, respectively.