锻压技术

P92钢管反挤压制坯和热挤压成形工艺数值模拟及试制

英文标题：Numerical simulation and trail production of backward extrusion billet making and hot extrusion forming process for P92 steel pipe

作者：刘海江1 王莹莹1 孙述利2 刘鹏飞1 王星1 王乐1

单位：1.内蒙古北方重工业集团有限公司 2.太原科技大学材料科学与工程学院

关键词：P92钢管反挤压正挤压热挤压温度晶粒尺寸

分类号：TG316

出版年,卷(期):页码：2025,50(3):248-254

摘要：

基于Gleeble-3500热模拟实验平台,测试了P92钢在不同变形温度、不同应变速率下的真应力-真应变曲线，获得动态再结晶模型和晶粒长大模型。采用Deform软件，对P92钢管的反挤压制坯和正挤压成形过程进行了数值模拟。结果表明，穿孔制坯过程中等效应变最大值分布在冲头圆周与坯料接触处，坯料与穿孔针下端面接触表面形成较低温度区域。正挤压过程中随着导流角从20°逐渐增加至50°，坯料内部的最大等效应变逐渐降低，由坯料内部移动到坯料表面与模具接触区域，使坯料内部剪应力逐渐消除。对于在1100、1200和1300 ℃这3种典型热挤压温度下挤压成形的P92钢管,热挤压温度越高，晶粒尺寸细化越明显。

Based on the Gleeble-3500 thermal simulation experimental platform, the true stress-true strain curves of P92 steel were tested under different deformation temperatures and strain rates, and the dynamic recrystallization and grain growth models were obtained. Numerical simulations were conducted on the backward extrusion billet making and forward extrusion forgming process of P92 steel pipes using the Deform software. Results indicate that the maximum value of equivalent strain during the piercing process for billet making is distributed at the contact area between punch circumference and billet, a lower temperature zone is formed on the contact surface between billet and lower end of piercing plug. With the diversion angle gradually increasing from 20° to 50° during the forward extrusion process, the maximum equivalent strain inside the billet is gradually decreased and moved from the inside of billet to the contact area between billet surface and die, and the shear stress inside the billet is gradually eliminated. For P92 steel pipes extrudet at the three typical hot extrusion temperatures of 1100 , 1200 and 1300 ℃, the higher the hot extrusion temperature, the more obvious the grain size refinement.

基金项目：

作者简介：刘海江（1979-），男，硕士，正高级工程师 E-mail：13848522181@163.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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