锻压技术

皮尔格冷轧304不锈钢管组织及性能研究

英文标题：Research on microstructure and properties for Pilger cold rolled 304 stainless steel tube

单位：太原科技大学

分类号：TG335.71

出版年,卷(期):页码：2019,44(6):53-58

摘要：

通过皮尔格轧制实验和数值仿真技术相结合的方法对304不锈钢管成形过程进行研究，借助金相显微镜与拉伸实验，重点分析304不锈钢管成形过程中组织演变及力学性能的变化规律。结果表明：成形时管材上任意点处的金属流动方向处于不断变化的过程，晶粒内部流线呈无规则分布；内壁所受的等效应力要大于外壁所受的等效应力，内壁组织剪切滑移带更为明显，变形程度更加剧烈，轧制过程中发生碎化，钢管平均晶粒尺寸减小；钢管在轧制过程中维式硬度值不断增大，由轧前的236 HV增加到403 HV，且屈服强度和抗拉强度也随着轧制的进行而增大，分别由轧前的352和794 MPa提高至轧后的745和1209 MPa。

The forming process of 304 stainless steel tube was studied by the method combining Pilger rolling experiment and numerical simulation technology, and the changes law of microstructure and mechanical properties of 304 stainless steel tube during forming process were analyzed by metallographic microscope and tensile test. The results show that the metal flow direction at any point on the tube in the forming process is in a changing process, and the internal flow lines of grains are randomly distributed. Then, the equivalent stress on the inner wall is greater than that on the outer wall, the shear band of the inner wall is more obvious, and the deformation is more severe. Furthermore, the crushing occurs during the rolling process, and the average grain size of steel tube decreases. The hardness of steel tube increases from 236 HV before rolling to 403 HV after rolling continuously, and the yield strength and tensile strength also increase with the progress of rolling from 352 and 794 MPa before rolling to 745 and 1209 MPa after rolling, respectively.

基金项目：

国家重点研发计划项目(2018YFB1307902);国家自然科学基金资助项目（U1710113）；中国博士后科学基金项目（2017M622903）；山西省重点研发计划重点项目（201703D111003，201703D111002）；山西省重点研发计划一般项目（201703 D121008）；山西省研究生联合培养基地人才培养项目（2018JD33）

李伟（1994-），男，硕士研究生 E-mail：854523935@qq.com 通讯作者：楚志兵（1981-），男，博士，教授 E-mail：chuzhibing@tyust.edu.cn

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