氮对Q345钢力学性能的影响

The effect of nitrogen on the mechanical property of Q345 steel

试验钢为含钒800×10-6的Q345钢,氮的质量分数按0%,0.018%,0.022%,0.034%,0.042%,0.052%逐渐升高.通过提高氮含量,来促进钒的析出,使钒得到充分利用.随着氮含量的增加,金相组织得到明显细化.增氮后钢的力学性能得到明显增强,4#试验钢的氮含量为0.034%,钢的屈服强度相比不含氮的1#试验钢,抗拉强度提高了46 MPa,屈服强度提高了124 MPa.1#试验钢的冲击功为64.4 J,随着氮含量的增高,冲击功也得到提高,3#试验钢的冲击功为159.9 J.当氮含量继续增加时,冲击功开始降低,6#钢的冲击功为59.7 J.

Q345 containing vanadium of 800 × 10-6 in mass fraction was used as the test steel,with its nitrogen mass fraction increased gradually by 0%,0. 018%,0. 022%,0. 034%,0. 042% and 0. 052%. With the increase of nitrogen content,the metallurgical structure was significantly refined. The mechanical properties of the steel after nitrogen addition were significantly enhanced. The nitrogen mass fraction of the 4#test steel was 0. 034%. The yield strength of steel was higher than that of the 1#steel without nitrogen,the tensile strength was increased by 46 MPa,and the yield strength was increased by 124 MPa. The impact energy of 1#test steel is64. 4 J. With the increase of nitrogen content,the impact work is also improved. The impact energy of 3#test steel is 159. 9 J. As the nitrogen content continues to increase,the impact work begins to decrease. The impact energy of 6#steel is 59. 7 J.