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以316不锈钢粉为原料,采用高能球磨方法制备了316不锈钢纳米晶粉末,研究了放电等离子烧结(SPS)纳米不锈钢粉末的过程特点,以及SPS制备工艺参数对材料结构和性能的影响规律。研究结果表明,采用SPS技术可以实现纳米不锈钢粉末的快速烧结,在1050℃保温5 min的烧结条件下试样致密度达到98%以上,材料的抗弯强度为1427 MPa,弹性模量为126 MPa,硬度为68.5 HRA。透射电镜结果表明SPS烧结后,材料晶粒没有过度生长,晶粒尺度约为200 nm,获得了纳米晶粒的不锈钢材料。
Using 316 stainless steel as raw material, 316 stainless steel nanocrystalline powder was prepared by high-energy ball milling. The characteristics of SPS process and the influence of SPS preparation parameters on the structure and properties of the material were studied. The results show that the rapid sintering of nano-sized stainless steel powder can be achieved by using SPS technology. The density of the sample reaches 98% under sintering conditions of 1050 ℃ for 5 min, the flexural strength of the material is 1427 MPa and the elastic modulus is 126 MPa , A hardness of 68.5 HRA. Transmission electron microscopy results show that after SPS sintering, the material grains do not overgrowth, the grain size is about 200 nm, and the nanocrystalline stainless steel material is obtained.