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本文对基体钢65Cr_4W_3Mo_2VNb进行了压缩式形变热处理的实验研究,采用高温(900℃)及低温(550℃)不同变形量后分别进行油淬、270℃、240℃等温淬火,得到形变M及形变B+M组织。观察了形变前、后M及B+M组织及亚结构,用电子衍射法测定了形变过程中及回火后析出的碳化物,用x射线法定性地测量了Ar量及位错密度。研究了形变对M及B+M硬度的影响及对回火后硬度的影响,已经查明:高温形变使该钢的二次硬化峰得到加强,低温形变使二次硬化提前出现。将高温形变热处理用于螺钉一字槽冷镦模可以简化生产流程,改善流线分布,提高模具寿命1.6～4倍。
In this paper, the compression deformation heat treatment of 65Cr_4W_3Mo_2VNb steel was carried out. After deformation at high temperature (900 ℃) and low temperature (550 ℃), the specimens were oil quenched, isothermally tempered at 270 ℃ and 240 ℃ respectively, + M organization. The microstructures and substructures of M and B + M before and after deformation were observed. The carbides precipitated during and after tempering were measured by electron diffraction. The amounts of Ar and dislocations were qualitatively determined by X-ray diffraction. The effect of deformation on the hardness of M and B + M and the effect on the hardness after tempering have been studied. It has been found that the high temperature deformation enhances the secondary hardening peak of the steel, and the low temperature deformation causes the secondary hardening to appear earlier. The high temperature deformation heat treatment for the screw slotted cold heading die can simplify the production process to improve the flow distribution and improve the life of the mold 1.6 to 4 times.