Present Situation and Prospect of Residual Stress Modelling Technology in Metal Cutting

2014 ◽  
Vol 800-801 ◽  
pp. 601-606
Author(s):  
Wei Zhang ◽  
Xiao Liang Cheng ◽  
Min Li Zheng ◽  
Zhao Xing Zhang ◽  
Shu Qi Wang
Keyword(s):  
Residual Stress ◽  
Phase Transformation ◽  
Thermal Stress ◽  
Stress State ◽  
Mechanical Stress ◽  
Metal Cutting ◽  
Mutual Influence ◽  
Present Situation ◽  
Type Size ◽  
External Loads

Residual stress ,with the branch of type, size and direction, is defined as the stress state which exists in a body after all the external loads are removed [1].According to the mutual influence scope size,residual stress can be divided into macroscopic residual stress and micro residual stress. Cutting residual stress is mainly caused by mechanical stress, thermal stress and phase transformation.

Generation Behavior of Thermal and Residual Stresses Due to Phase Transformation During Welding Heat Cycles

2002 ◽  
Author(s):  
Masahito Mochizuki ◽  
Shogo Matsushima ◽  
Masao Toyoda ◽  
Zhiliang Zhang ◽  
O̸yvind Gundersen ◽  
...  
Keyword(s):  
Residual Stress ◽  
Phase Transformation ◽  
Thermal Stress ◽  
Material Properties ◽  
Stress Generation ◽  
Experimental Result ◽  
High Tensile Strength ◽  
Weld Residual Stress ◽  
History Of ◽  
Simulation And Experiment

Weld residual stress is possible to be controlled by considering and changing mechanical properties of the materials. History of thermal stress due to phase transformation and residual stress during welding heat cycles is studied in order to investigate the generating mechanism of residual stress and the effects of material properties on stress generation. Two materials of high-tensile strength steels are used in the numerical simulation and experiment. Material property of each microstructural phase is used and the time- and temperature-dependant proportion of microstructure are considered by using CCT-diagram in the analysis. Thermal stress history obtained by the simulation agrees well with the experimental result during welding heat cycles.

Thermal stress history in high-tensile strength steels during weld process

2004 ◽  
Vol 120 ◽  
pp. 635-648
Author(s):  
M. Mochizuki ◽  
M. Toyoda
Keyword(s):  
Residual Stress ◽  
Tensile Strength ◽  
Phase Transformation ◽  
Thermal Stress ◽  
Stress Generation ◽  
Experimental Result ◽  
High Tensile Strength ◽  
Stress History ◽  
Fundamental Study ◽  
History Of

Thermal and residual stresses in High-Tensile Strength Steels during weld process are numerically simulated considering phase transformation effect. Fundamental study for the history of thermal stress due to phase transformation and residual stress during welding heat cycles is studied in order to investigate the generating mechanism of residual stress and the effects of material properties on stress generation. Two materials of high-tensile strength steels are used in the numerical simulation and experiment. Material property of each microstructural phase is used and the time- and temperature-dependant proportion of microstructure are considered by using CCT-diagram in the analysis. Thermal stress history obtained by the simulation agrees well with the experimental result during welding heat cycles. Some applications to repair welds and fillet-weld joints of the analytical method are then introduced.

scholarly journals Influence of Preaging Temperature on the Indentation Strength of 3Y-TZP Aged in Ambient Atmosphere

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2767
Author(s):  
Ki-Won Jeong ◽  
Jung-Suk Han ◽  
Gi-Uk Yang ◽  
Dae-Joon Kim
Keyword(s):  
Residual Stress ◽  
Phase Transformation ◽  
Low Temperature ◽  
Compressive Residual Stress ◽  
Yttria Stabilized Zirconia ◽  
Ambient Atmosphere ◽  
Aged Specimen ◽  
Stabilized Zirconia ◽  
M Phase ◽  
The Relationship

Yttria-stabilized zirconia (3Y-TZP) containing 0.25% Al2O3, which is resistant to low temperature degradation (LTD), was aged for 10 h at 130–220 °C in air. The aged specimens were subsequently indented at loads ranging from 9.8 to 490 N using a Vickers indenter. The influence of preaging temperature on the biaxial strength of the specimens was investigated to elucidate the relationship between the extent of LTD and the strength of zirconia restorations that underwent LTD. The indented strength of the specimens increased as the preaging temperature was increased higher than 160 °C, which was accompanied by extensive t-ZrO2 (t) to m-ZrO2 (m) and c-ZrO2 (c) to r-ZrO2 (r) phase transformations. The influence of preaging temperature on the indented strength was rationalized by the residual stresses raised by the t→m transformation and the reversal of tensile residual stress on the aged specimen surface due to the indentation. The results suggested that the longevity of restorations would not be deteriorated if the aged restorations retain compressive residual stress on the surface, which corresponds to the extent of t→m phase transformation less than 52% in ambient environment.

scholarly journals Process Signature for Laser Hardening

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 465
Author(s):  
Friedhelm Frerichs ◽  
Yang Lu ◽  
Thomas Lübben ◽  
Tim Radel
Keyword(s):  
Residual Stress ◽  
Phase Transformation ◽  
Heating Time ◽  
Temperature Gradients ◽  
Laser Hardening ◽  
Thermal Loads ◽  
Zero Crossing ◽  
Residual Stress State ◽  
Stress Curve ◽  
Process Signature

During many manufacturing processes for surface treatment of steel components heat will be exchanged between the environment and the workpiece. The heat exchange commonly leads to temperature gradients within the surface near area of the workpiece, which involve mechanical strains inside the material. If the corresponding stresses exceed locally the yield strength of the material residual stresses can remain after the process. If the temperature increase is high enough additionally phase transformation to austenite occurs and may lead further on due to a fast cooling to the very hard phase martensite. This investigation focuses on the correlation between concrete thermal loads such as temperature and temperature gradients and resulting modifications such as changes of the residual stress, the microstructure, and the hardness respectively. Within this consideration the thermal loads are the causes of the modifications and will be called internal material loads. The correlations between the generated internal material loads and the material modifications will be called Process Signature. The idea is that Process Signatures provide the possibility to engineer the workpiece surface layer and its functional properties in a knowledge-based way. This contribution presents some Process Signature components for a thermally dominated process with phase transformation: laser hardening. The target quantities of the modifications are the change of the residual stress state at the surface and the position of the 1st zero-crossing of the residual stress curve. Based on Finite Element simulations the internal thermal loadings during laser hardening are considered. The investigations identify for the considered target quantities the maximal temperature, the maximal temperature gradient, and the heating time as important parameters of the thermal loads.

Study on CNC Milling Heat and Residual Stress Relationship Model

2016 ◽  
Vol 693 ◽  
pp. 900-905
Author(s):  
W.W. Song ◽  
J.L. Wang ◽  
H.F. Wang ◽  
Dun Wen Zuo
Keyword(s):  
Residual Stress ◽  
Deformation Theory ◽  
Metal Cutting ◽  
Milling Process ◽  
Cnc Milling ◽  
Theoretical Support ◽  
Cutting Heat ◽  
Relationship Model ◽  
Milling Temperature ◽  
Problem Solving Process

In this paper, the effect of the cutting heat on the workpiece in the processing was studied. Its essence is to study relationship between the workpiece temperature variation and internal residual stress distribution. In the specific problem-solving process, the metal cutting theory, finite element related knowledge and metal elastoplastic deformation theory were combined, and established a mathematical model which was suitable for the model of the milling temperature and residual stress in the milling process. It would provide theoretical support for future study on milling deformation mechanism.

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