Laser & Optoelectronics Progress, Volume. 59, Issue 13, 1300002(2022)
Residual Stress and Stress Corrosion of Alloy Materials in Laser Additive Manufacturing
Figures & Tables(5)
Table 1. Comparison of residual stress testing methods
View tableTable 1. Comparison of residual stress testing methods
Method Technology Advantage Disadvantage Mechanical method Drilling method Simple principle，cheap equipment，easy to operate Damage to the material，measurement accuracy is not high Nanoindentation method High resolution，make the material deform in a very small range without destroying the structural integrity of the material，high measurement efficiency Measurement result is not unique，the measurement accuracy is not high Physical method X-ray diffraction method The measurement result is more accurate，the material is not damaged，the strain field distribution on the surface of the material can be measured Can only measure near-surface information，testing instruments are expensive Neutron diffraction method Large penetration depth，three-dimensional stress field distribution can be obtained Experimental equipment is expensive
Table 2. Main method of laser cladding layer to improve residual stress
View tableTable 2. Main method of laser cladding layer to improve residual stress
Method Scope of application Preheating Suitable for key components of high-value and high-precision equipment，not suitable for industrialized mass-produced products Ultrasonic shock or vibration Suitable for improving small size and relatively large size components Laser process control Suitable for laser additive manufacturing of workpieces and laser cladding layers
Table 3. Comparison of stress corrosion testing methods
View tableTable 3. Comparison of stress corrosion testing methods
Method Evaluation index Advantage Disadvantage Applicability Constant load method Time to break，percentage of breaking elongation Initial stress determination，simple test method，no restriction on sample type and size Unable to obtain crack growth information Cladding layer，bulk material Constant displacement method Time to break Device is simple and easy to implement，and can obtain crack growth parameters Unclear stress state，long test period Cladding layer，bulk material Slow strain rate method Time to break，percentage of breaking elongation，section shrinkage Short test period，high sensitivity to stress corrosion cracking Complex equipment and strain rate have a significant impact on the results Cladding layer，bulk material
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Xingshou Zhang, Qinying Wang, Huaibei Zheng, Tingyao Liu, Lijin Dong, Yuchen Xi, Jin Zhang, Shulin Bai. Residual Stress and Stress Corrosion of Alloy Materials in Laser Additive Manufacturing[J]. Laser & Optoelectronics Progress, 2022, 59(13): 1300002
Paper Information
Category: Reviews
Received: Jun. 29, 2021
Accepted: Aug. 9, 2021
Published Online: Jun. 9, 2022
The Author Email: Qinying Wang (wangqy0401@126.com)
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