Strengthening and toughening mechanisms of deposited metals for 420 MPa weathering bridge steel
ZHUO Xiao1,2, AN Tong-bang1, MA Cheng-yong1
1. Department of Welding, Central Iron and Steel Research Institute, Beijing 100081, China; 2. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, Hebei, China
Abstract：The microstructure and mechanical properties of three kinds of deposited metals containing 3 different Si and Mn mass percent for 420 MPa grade weathering bridge steel were investigated. The effects of Si and Mn mass percent on the toughening and corrosion resistance of deposited metals were analyzed by scanning electron microscope (SEM),transmission electron microscope (TEM) and electrochemical measurement. The results showed that impact toughness of deposited metals was improved with the decrease of Mn and Si contents. When the Si mass percent was 0.32%,the strength of the deposited metal decreased by 5% and the impact energy was increased by 40%,accompanied with Mn mass percent decreased from 1.34% to 1.05%. When the Mn mass percent was 1.05%,the strength decreased by 2% and the impact energy was increased by 24% as the Si mass percent decreased from 0.34% to 0.20%. The increase of impact toughness was attributed to the decrease of the proportion of proeutectoid ferrites (including ferrite side plate) in the columnar and coarse grain reheated zone,and to the increase of acicular ferrites and the decrease of the size of M-A components that make the crack growth path more tortuous and the crack growth work increased. Further,the toughness and corrosion resistance were matched with the test steel as the self-corrosion potential difference between the deposited metals and the weathering steel was less than 20 mV.
卓晓, 安同邦, 马成勇. 420 MPa级耐候桥梁钢用焊材熔敷金属强韧化规律[J]. 钢铁, 2020, 55(4): 88-94.
ZHUO Xiao, AN Tong-bang, MA Cheng-yong. Strengthening and toughening mechanisms of deposited metals for 420 MPa weathering bridge steel. Iron and Steel, 2020, 55(4): 88-94.
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2020, Vol. 55 
