抛丸预处理对45钢气体渗碳效率及渗层特性的影响

Effect of shot blasting pretreatment on gas carburizing efficiency and layer properties of 45 steel

采用光学显微镜、显微硬度计等方法研究了抛丸预处理对45钢气体渗碳效率及渗层特性的影响。结果表明,在相同气体渗碳工艺情况下,抛丸预处理对45钢气体渗碳有明显促进作用,抛丸预处理渗碳试样有效硬化层由0.994 mm增加到1.486 mm,渗碳效率提升39%以上,表面硬度提高10%以上。相较于未抛丸渗碳试样,抛丸预处理使渗碳试样截面梯度硬度升高且由表及里下降更为平缓,降低渗碳层脆性。

Effect of shot blasting pretreatment on gas carburizing efficiency and layer properties of 45 steel was studied by means of optical microscope and microhardness tester.The results show that under the same gas carburizing process,shot blasting pretreatment can obviously promote the gas carburizing of the 45 steel,the effective hardening layer of the pretreated carburized specimen increases from 0.994 mm to 1.486 mm,the carburizing efficiency increases by more than 39%,and the surface hardness increases by more than 10%.Compared with the non-shot blasting carburized specimen,shot blasting pretreatment makes the gradient hardness of carburized specimen section increase and decrease more gently from the outside to the inside,reducing the brittleness of carburized layer.