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张泽晨，等： S355NL钢风电法兰锻件低温冲击韧性不良的原因


                ［19］ 潘中德，郭甲男，胡其龙. 正火温度轧制和正火处理的                    ［20］ 张健，欧阳鑫，胡昕明，等. 模拟焊后热处理次数对


                   S355NL钢板的力学性能和显微组织 ［J］. 上海金属，                     Q345R钢板力学性能的影响 ［J］. 鞍钢技术，2021（4）：
                   2022，44（2）：61-64.                                 30-32.
                   PAN Z D，GUO J N，HU Q L. Mechanical properties       ZHANG  J，OUYANG  X，HU  X  M，et  al.  Effect
                   and  microstructure  of  S355NL  steel  plate  rolled  at   of  simulating  post-weld  heat  treatment  times  on
                   normalized  temperature  and  normalized［J］. Shanghai   mechanical properties of Q345R steel plate［J］. Angang
                   Metals，2022，44（2）：61-64.                          Technology，2021（4）：30-32.



                      Cause of Poor Low Temperature Impact Toughness of S355NL Steel

                                             Wind Power Flange Forgings

                            ZHANG Zechen, CAO Tieshan, ZHAO Jie, LYU Dechao, CHENG Congqian

                         (School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China)
                       Abstract: The impact absorbed energy at −50 ℃ of a certain batch of S355NL steel flange forgings used in wind
                  power from a factory were low and fluctuated significantly. The cause of poor impact toughness at low temperatures was
                  analyzed by comparing the mechanical properties, fracture morphology, and microstructure of qualified and unqualified
                  flange forgings and combining with the production process. The results show that the impact fracture of unqualified
                  flange forgings was characterized by brittle fracture, the fiber section rate was almost 0, and the crack propagation path
                  was relatively straight during the impact process. The impact fracture of qualified flange forgings was characterized by a
                  mixture of ductile and brittle fracture morphology, the fiber section rate was 60%, and the crack propagation path was
                  more tortuous. High normalizing temperature and long heating time in the furnace resulted in coarse grains and uneven
                  grain size distribution, that was the main reason for poor temperature impact toughness of S355NL steel flange forgings.
                  Uneven distribution of pearlite in the structure was another reason for the reduction of toughness of flange forgings.
                       Key words: S355NL steel flange forging; low temperature impact toughness; microstructure; fracture morphology






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