Influence of External Constraint on Welding Residual Stress of NM450TP Steel T-joint

doi:10.3901/JME.2025.20.091

Abstract

Abstract: NM450TP is a new type of quenched wear-resistant steel, it is a low-cost ultra-high strength steel which has been widely used in construction machinery and mining machinery in recent years. However, there is no systematic and in-depth research on the welding residual stress of typical joints of such materials in China at present. Taking NM450TP steel as the research object, the welding residual stress and its evolution process of T-joints under free state and external constraint were studied by numerical simulation and experimental methods. Based on the results of microstructure observation and hardness measurement, a solid phase transformation and softening model of NM450TP steel during welding was established. A thermo-elastic-plastic finite element method of "temperature-microstructure-stress" coupling was developed on the platform of special software SYSWELD. The temperature field and residual stress of T-joints of NM450TP steel are numerically simulated with the developed method and compared with the experimental results. In addition, based on the numerical simulation results, the influence of external constraint on the longitudinal and transverse residual stress of T-joints is discussed. The numerical simulation results show that the volume expansion caused by the martensitic transformation in the HAZ of NM450TP steel decreases the peak value of the transverse residual stress. The research results provide a theoretical basis for the formulation of welding technology of these materials in practical engineering applications.

Key words: NM450TP steel, solid-state phase transformation, softening effect, residual stress, numerical simulation

CLC Number:

TG404

LI Guannan, MAO Zhixu, WANG Chongyang, HU Long, DENG Dean. Influence of External Constraint on Welding Residual Stress of NM450TP Steel T-joint[J]. Journal of Mechanical Engineering, 2025, 61(20): 91-102.

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