氮对GCr15轴承钢高温力学性能的影响

Effect of Nitrogen on Mechanical Properties of Bearing Steel GCr15 at Elevated Temperature

实验用钢GCr15(%:0.97～1.03C、1.43～1.59Cr)用10 kg真空感应炉熔炼,在充氩情况下,使用氮化硅向钢中加0.1%～0.3%氮。通过Gleeble-1500热模拟试验机对该钢的锻材在700～1150℃进行拉伸试验,并用光学显微镜、扫描电子显微镜观察断口形貌和纵向组织。结果表明,氮在钢中以固溶形式存在,随氮含量增加,高温下钢的断面收缩率有较大提升,峰值应力提升不明显。

The test steel GCrl5 （ % ： 0. 97 - 1.03C, 1.43 - 1.59Cr） is melted by a 10 kg vacuum induction furnace and added 0. 1% -0. 3% nitrogen in steel by silicon nitride at argon atmosphere. The tensile test of the forged steel at 700 - 1 150 ℃ has been carried out by using a Cleeble-1500 thermal simulation machine, and the morphology of fracture and longitudinal structure is observed by scanning electron microscope and optical microscope. Results show that nitrogen in steel is in the form of solution; and with increasing nitrogen content, the reduction of area of the steel at elevated temperature increases obviously while the peak stress of the steel increases slightly.