Dynamic Mechanics Behaviors of 1Cr12 Weld Cooling Based on Coupling of Phase Transformation and Contraction

doi:10.3969/j.issn.1004-132X.2021.03.012

Abstract

Abstract: Considering the following hardening and transformation plasticity, the solid-state transformation model of volume strain and mixed-phase mechanics properties was established. The effects of various factors on the dynamic mechanics behavior of 1Cr12 steel weld cooling were studied. The experiments of welding longitudinal residual stress were carried out, the results of tests are in good agreement with the simulation ones. It is shown that the volume expansions of martensitic transformation, the changes of mechanics properties and the plastic mechanism have influences on the dynamic mechanics behaviors of weld shrinkages, and the longitudinal stress of weld joint changes from contraction tensile states to compression states under the action of various factors.

Key words: solid phase transformation, mechanics of weld contraction, finite element method, material model

摘要： 建立了相变体积应变与混合相力学性能的固态相变模型，同时考虑随动硬化与相变塑性的影响，研究了各因素对1Cr12钢焊缝冷却动态力学行为的影响规律。在此基础上，开展了焊接试验件纵向残余应力的验证试验，试验结果与模拟结果吻合良好。研究结果表明：马氏体相变的体积膨胀、力学性能变化以及塑性机制均对焊缝收缩的动态力学行为有一定的影响，且各因素共同作用下焊缝纵向应力由收缩拉伸状态转为受压状态。

关键词: 固态相变, 焊缝收缩力学, 有限元方法, 材料模型

CLC Number:

TP404

XU Qian1,2;HU Guangxu3;DONG Zhibo4;REN Xinxing4;FANG Hongyuan4. Dynamic Mechanics Behaviors of 1Cr12 Weld Cooling Based on Coupling of Phase Transformation and Contraction[J]. China Mechanical Engineering, DOI: 10.3969/j.issn.1004-132X.2021.03.012.

许谦1，2;胡广旭3;董志波4;任新星4;方洪渊4. 基于相变与收缩耦合的1Cr12焊缝冷却动态力学行为[J]. 中国机械工程, DOI: 10.3969/j.issn.1004-132X.2021.03.012.

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