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Effects of Laser Scanning Strategy on Bending Behavior and Microstructure of DP980 Steel
Wenbin Dong1,2, Yajing Zhang1, Le Bao2
1Department of Mechanical Engineering, Anhui Science and Technology University, Chuzhou 233100, China.
Materials (Basel, Switzerland)
|May 25, 2024
Summary
This study explores laser bending of DP980 steel, finding that accumulated line energy density (AED) and microstructure significantly impact bending efficiency. Multiple scans enhance bending angles by altering the steel
Area of Science:
- Materials Science
- Manufacturing Engineering
Background:
- Laser bending is a key cumulative forming technology.
- Bending efficiency is a critical performance index for laser bending.
Purpose of the Study:
- Investigate DP980 steel plate bending behavior and microstructure under varied laser scanning strategies.
- Determine the influence of accumulated line energy density (AED) and scanning passes on bending efficiency.
Main Methods:
- Utilized an IPG laser system for experiments on DP980 steel plates.
- Varied accumulated line energy density (AED) by adjusting laser scanning velocity and number of scans.
- Analyzed bending angles and microstructural changes.
Main Results:
- Bending angle increases non-linearly with AED in single scans, plateauing at higher values.
- Multiple laser scans increased bending angle by at least 26% compared to single scans for the same AED.
- Optimal bending achieved with higher AED and appropriate peak temperatures, promoting uniform martensite and grain refinement.
- Excessive peak temperatures led to grain growth, hindering bending.
Conclusions:
- Bending efficiency in DP980 steel is governed by both AED and microstructural evolution.
- Laser scanning strategies, including AED and multiple passes, are crucial for optimizing bending performance.
- Microstructure control, specifically uniform martensite formation and grain refinement, is key to enhanced laser bending.
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