40Cr钢滚刀织构表面激光淬火的数值模拟

Numerical simulation of laser hardening of 40Cr steel hob textured surface

对激光淬火后40Cr钢盾构滚刀织构表面进行数值模拟,通过模拟激光淬火过程中的温度变化分析激光淬火过程中温度变化引起的相变,以及激光淬火硬化层形成机理。观察激光淬火后40Cr钢盾构滚刀硬化层形貌,并对40Cr钢、40Cr钢盾构滚刀织构表面及激光淬火后的40Cr钢盾构滚刀织构表面进行摩擦磨损试验,研究其摩擦磨损性能。结果表明,40Cr钢盾构滚刀表面存在平行沟槽状织构,该织构和激光淬火能够有效提高工件耐磨性,激光淬火后盾构刀具织构表面具有最高的耐磨性,其截面磨损面积是盾构刀具织构表面的47.3%,是无织构40Cr钢的37.3%。激光淬火有限元数值模拟具有可靠性,激光淬火可有效提高盾构滚刀耐磨损性能。

Numerical simulation was conducted on the textured surface of 40Cr steel shield tunneling cutter after laser hardening.By simulating the temperature changes during laser hardening,the phase transformation caused by temperature changes during laser hardening was analyzed,as well as the formation mechanism of the laser hardened layer.The morphology of the hardened layer on the 40Cr steel shield tunneling cutter after laser hardening was observed.Friction and wear tests were projected on 40Cr steel,40Cr steel shield tunneling cutter textured surface,and laser hardened 40Cr steel shield tunneling cutter textured surface to study their friction and wear properties.The results show that there is a parallel groove like texture on the surface of the 40Cr steel shield tunneling cutter.This texture and laser hardening can effectively improve the wear resistance of the cutter.After laser hardening,the textured surface of the shield tunneling cutter has the highest wear resistance,with a cross-sectional worn area of 47.3%of the textured surface of the shield tunneling cutter and 37.3%of the non textured surface of the 40Cr steel.The finite element numerical simulation is reliable and laser hardening can effectively improve the wear resistance of the shield tunneling cutter.