锻压技术

变截面超高强韧钢核心部件径向空心锻造工艺

英文标题：Radial hollow forging process on key components for ultra-high strength and tough steel with varible cross-section

分类号：TG316

出版年,卷(期):页码：2025,50(3):128-136

摘要：

为实现超高强韧钢核心部件强度与冲击性能的合理匹配，在Gleeble3500热模拟试验机上对Cr-Ni-Mo-V钢在温度为850~1250 ℃、应变速率为1~10 s-1、变形量为50%的条件下进行了热压缩实验，获得了该变形条件下的真应力-真应变曲线并建立了不同应变条件下的热加工图，确定实心锻造和径向缩管锻造温度为1150 ℃，径向空心锻造温度为1220~1250 ℃。基于32CrNi3MoVE钢的CCT曲线和TTT曲线，结合Jmatpro模拟结果，确定了碳化物的相变温度,并与传统成形工艺对比，确定采用挤压开坯+精锻机径向锻造成形工艺，在此基础上，研究3种不同径向锻造变形方式对变截面超高强韧钢核心部件组织和性能的影响。结果表明，采用两火径向带芯棒空心锻造方式，能够有效打碎和细化原有的铸态枝晶，均匀锻造变形组织，强度同等的条件下，可提高低温冲击韧性。

In order to achieve a reasonable match between the strength and impact properties of the key components for ultra -high strength and toughness steel, a thermal compression experiment was conducted on 32CrNi3MoVE steel at a temperature of 850-1250 ℃, a strain rate of 1-10 s-1, and a deformation amount of 50% by thermal simulator Gleeble3500, and the stress-strain curves under the deformation conditions were obtained to established the thermal processing maps under different strain conditions. Then, the forging temperatures of solid and radial shrinkage tubes were determined to be 1150 ℃, and the radial hollow forging temperatures of tubes were 1220-1250 ℃. Furthermore, based on the CCT and TTT curves of 32CrNi3MoVE steel, combined with the Jmatpro simulation results, the phase transformation temperature of carbide was determined. Compared with the traditional forming process, the extrusion blanking + radial forging process by fine forging machine was determined, and on this basis, the influences of three different radial forging deformation methods on the microstructure and properties of the key components for ultra-high strength and toughness steel with variable cross-section were studied. The results show that the radial hollow forging method by two-fire and with mandrel can effectively break and refine the original as-cast dendrites, uniformly forge the deformed structure, and improve the low-temperature impact toughness under the same strength conditions.

基金项目：

国防基础科研计划（JCKY2022208A002）

作者简介：王交其（1967-），男，学士，正高级工程师 E-mail：Wang8428225001257@qq.com 通信作者：王莹莹（1982），女，硕士，高级工程师 E-mail：yy1257@qq.com

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