稀土H13模具钢横向冲击性能影响因素分析

Analysis of influencing factors on transverse impact properties of rare earth H13 die steel

为探究稀土H13模具钢锻件横向冲击性能偏低的影响因素,对钢材锻件冒口端试片分别进行低倍组织分析、显微组织分析、SEM以及EDS分析。结果表明,添加稀土的H13模具钢的低倍组织和显微组织(包括带状组织、非金属夹杂物和网状碳化物)都能满足不同标准中的技术要求,钢材的纯净度相对较高;单向拔长后,沿着主变形方向晶界处析出一定数量的链状或网状碳化物,枝晶间存在的大尺寸液析碳化物和基体组织中存在的未锻透枝晶组织是影响稀土H13模具钢横向冲击性能的主要因素。

In order to explore the influence factors on transverse impact properties of the rare earth H13 die steel forgings,macrostructure analysis,microstructure analysis,SEM and EDS analysis of fracture surface were carried out on the riser end specimens of steel forgings.The results show that the macrostructure and microstructure(including banded structure,non-metallic inclusion and network carbide)of the H13 die steel with rare earth addition can meet the qualification requirements of various industry standards,and the purity of the steel is relatively high.The chain-like or network carbides precipitate along the grain boundary of the main deformation direction after simplex stretching,the large-scale liquidus carbides between dendrites,and the unwrought dendrite structure in the matrix are the main factors that seriously affect the transverse impact properties of the rare earth H13 die steel.