The present study helps in providing a systematic approach towards the investigation of deep drawing and stretch forming processes for Inconel 625 alloy. Firstly, the flow stress nature and material properties of Inconel 625 super-alloy have been investigated and it has been found that temperature and deformation rate significantly affects the flow stress behavior. By using experimental flow stress data, four different constitutive models namely; modified Jhonson-Cook (m-JC), modified Zerilli-Armstrong (m-ZA), modified Arrhenius (m-A), Khan–Huang–Liang (KHL) model have been formulated of which m-A has been found to have the best predictability for flow stress. Hill 1948 and Barlat 1989 anisotropic yield criterion have also been applied and it has been found that Barlat 1989 criteria more accurately capture the yielding behavior of Inconel 625 alloy. The deep drawing analysis has been carried out using target and noise performance measures for different process parameters viz., temperature, punch speed and blank holding pressure. Uniformity in thickness has been major cause of concern, hence experiment at 473 K, 5 mm/min speed and 20 Bar pressure was found to have least variation in thickness. Furthermore, the forming limit diagram (FLD) and fracture curve (FC) obtained from stretch forming analysis along five different strain paths was found to be significantly affected by temperature. Further, user defined material (UMAT) subroutine have been incorporated in ABAQUS 6.13 software to have effect of m-A model and Barlat 1989 yield criteria in finite element analysis (FEA) of deep drawing and stretch forming processes.

本研究有助于为研究Inconel 625合金的深冲和拉伸成形工艺提供系统的方法。首先，研究了Inconel 625高温合金的流变应力性质和材料性能，发现温度和变形速率显着影响流变应力行为。通过使用实验流动应力数据，可以得到四个不同的本构模型。已经制定了改良的Jhonson-Cook（m-JC），改良的Zerilli-Armstrong（m-ZA），改良的Arrhenius（mA），Khan-Huang-Liang（KHL）模型，其中mA被认为具有最佳的可预测性流应力。Hill 1948和Barlat 1989各向异性屈服准则也已应用，并且发现Barlat 1989准则更准确地捕获了Inconel 625合金的屈服行为。使用目标和噪声性能指标针对不同的工艺参数（例如温度，冲压速度和毛坯保持压力）进行了深冲分析。厚度均匀性是引起关注的主要原因，因此发现在473 K，5 mm / min的速度和20 Bar的压力下进行的厚度变化最小。此外，发现沿五个不同应变路径通过拉伸成形分析获得的成形极限图（FLD）和断裂曲线（FC）受到温度的显着影响。此外，用户定义材料（UMAT）子例程已合并到ABAQUS 6中。