热处理对B+级钢铸件焊补区域硬度影响研究

Research on the effect of heat treatment on the hardness of welding repair area of B+Grade steel castings

由于砂型铸造生产的铸件在浇注及凝固过程中有产生裂纹、缩孔、砂眼、气孔等缺陷的可能性,为了修复铸件表面缺陷,焊补是B+级铸件生产过程中必不可少的工序。焊补及其后续热处理工艺对铸件质量及其力学性能有较大的影响,尤其是焊补区域及其热影响区的硬度分布不均会使铸件表面产生较大的残余应力,影响铸件的疲劳强度。通过对8组不同试件的焊补区域及其热影响区的硬度研究,深入浅出的分析了热处理工艺对B+级钢铸件焊补区域的硬度影响。

Due to the possibility of defects such as cracks,shrinkage holes,sand holes,and air holes in castings produced by sand casting during pouring and solidification,welding repair is an essential pro-cess in the production of B+grade castings to repair surface defects.Welding repair and subsequent heat treatment process have a great impact on the quality and mechanical properties of castings,especially the uneven distribution of hardness in the welding repair area and its heat-affected zone will cause large residual stress on the surface of castings and affect the fatigue strength of castings.By studying the hardness of the weld repair area and its heat-affected zone of 8 groups of different specimens,the influence of heat treatment process on the hardness of the weld repair area of B+steel castings has been analyzed in simple terms.