高应力作用下高钼高速钢能量吸收行为的研究

Energy Absorption Behavior of High Molybdenum High Speed Steel under High Stress Action

研究了含钼10%的高速钢(Mo10)能量吸收与应力、压缩次数的关系,对试样压缩前后进行了XRD及SEM检测分析,并对Mo10高速钢中基体及M2C碳化物进行了微米压痕实验。结果表明:Mo10高速钢随应力的增大,吸收的能量值呈二次曲线形式增加,随着压缩次数的增加,试样吸收的能量逐步减少;SEM检测结果表明,应力作用下裂纹容易在基体上产生;微米压痕实验表明随载荷增大基体的硬度增大,产生加工硬化;M2C碳化物在载荷为1 300 mN时会出现加工软化,能贮存更高弹性应变能。

The relationship among absorption, stress and compression times of high speed steel containing Mo 10%（Mo10） was researched, The samples before and after the compression was analyzed by XRD and SEM detection, and the micro indentation experiments of matrix and M2C carbides were conducted. The results show that, with the increase of the stress, absorbed energy increases in two times curve formi with the increase of the compression times, absorbed energy gradually reduces. The SEM testing results show that the crack is easily generated in the matrix under the action of stress. The micro indentation experiments show that with the load increase, the hardness of matrix increases, and harden. The work softening of MEC carbides appear when the load is 1 300 mN, which can store more elastic strain energy.