考虑位错硬化效应的P92钢晶体塑性模拟研究  

Study on Simulation of Plastic of P92 Steel Considering Effect of Dislocation Hardening

作　　者：王新宇 申俊杰[1,2] 郭祥如 乔吉新 赵庆权[3] 何彪[3] WANG Xinyu;SHEN Junjie;GUO Xiangru;QIAO Jixin;ZHAO Qingquan;HE Biao(Tianjin Key Lab oratory for Advanced Mechatronic System Design and Intelligent Control,School of Mechanical Engineering,Tianjin University of Technology,Tianjin 300384,China;National Demonstration Center for Experimental Mechanical and Electrical Engineering Education,Tianjin University of Technology,Tianjin 300384,China;Tianjin Pipe(Group)Corporation,Tianjin 300384,China)

机构地区：[1]天津理工大学天津市先进机电系统设计与智能控制重点实验室,天津300384 [2]天津理工大学机电工程国家级实验教学示范中心,天津300384 [3]天津钢管集团股份有限公司,天津300384

出　　处：《热加工工艺》2023年第14期30-35,40,共7页Hot Working Technology

基　　金：国家自然科学基金项目(51605330);天津市自然科学基金项目(18JCYBJC88700)。

摘　　要：基于晶体塑性理论,建立了考虑位错硬化效应的P92耐热钢晶体塑性有限元模型。应用模型模拟了P92钢在拉伸过程的塑性变形行为,进一步探究了不同滑移系开动对塑性变形的影响。结果表明:P92钢变形后应力应变、位错密度和形变储存能呈现不均匀分布,证实晶粒发生不均匀的塑性变形。其中位错运动是塑性变形的载体,在晶界处存在位错塞积导致应力应变集中和形变储存能升高;同时塑性变形受滑移系开动的影响,对比模型在不同滑移系统开动下的拉伸曲线,得出{110}<111>作为主滑移系统在单轴拉伸变形过程中起决定性作用。Based on the theory of crystal plasticity,a finite element model of the crystal plasticity of P92 heat-resistant steel considering the dislocation hardening effect was established.The model was used to simulate the plastic deformation behavior of P92 steel in the stretching process,and the influence of different slip systems on the plastic deformation was furtherly explored.The results show that the stress-strain,dislocation density and deformation storage energy of P92 steel present an uneven distribution after deformation,confirming that the grains undergo uneven plastic deformation.Among them,the dislocation movement is the carrier of plastic deformation,and the dislocation plugging at the grain boundary causes stress and strain concentration and deformation storage energy increase.At the same time,the plastic deformation is affected by the activation of the slip system.Compared the tensile curves of the model under different slip systems,it is concluded that{110}<111>as the main slip system plays a decisive role in the uniaxial tensile deformation process.

关 键 词：P92耐热钢 晶体塑性有限元 位错密度 滑移系 

分 类 号：TG113.25[金属学及工艺—物理冶金]