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Effect of metastable austenite on fracture resistance of quenched and partitioned (Q&P) sheet steels

机译:亚稳态奥氏体对淬火和分区(Q&P)钢板的抗断裂性能的影响

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摘要

The fracture resistance was comparatively characterized on two commercial sheet steel, quenched and partitioned (Q&P) steel and dual phase (DP) steel, with the same strength levels but differing by the phase constituents and by the ductility. In Q&P steel, transformation of martensite as well as its effect on fracture resistance by tension of double edge notched (DEN) plate specimens was investigated. The map of the distribution of transformation ratios measured locally around the notch was compared with the map of the plastic deformation zone computed by finite element simulations. The influence of stress triaxiality on austenite transformation kinetics was analyzed. Essential work of fracture of Q&P steel (290.9 kJ m~(-2)) was relatively lower than that of DP steel (544.8 kJ m~(-2)), however, it was found that the fracture resistance (work of fracture) of Q&P steel is effectively enhanced by the transformation of metastable austenite as stress triaxiality decreases. Through deduction, transformation of 8 vol% of austenite (ΔU_T) was proved to absorb 22%-35% of the increments of the work of fracture (ΔW).
机译:在两种商品钢板上,具有相同的强度水平,但相组成和延性不同,但具有两种强度的抗断裂性能得到了很好的表征:淬火和分隔(Q&P)钢和双相(DP)钢。在Q&P钢中,研究了马氏体的相变及其对双缺口板(DEN)板试样的拉伸强度的影响。将在缺口附近局部测量的变形比分布图与通过有限元模拟计算的塑性变形区图进行了比较。分析了应力三轴度对奥氏体转变动力学的影响。 Q&P钢的断裂基本功(290.9 kJ m〜(-2))相对低于DP钢的断裂基本功(544.8 kJ m〜(-2)),但是发现抗断裂性(断裂功)随着应力三轴性的降低,亚稳奥氏体的转变有效地增强了Q&P钢的强度。通过推论,证实了8体积%的奥氏体相变(ΔU_T)吸收了22%-35%的断裂功增量(ΔW)。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第7期|57-63|共7页
  • 作者单位

    School of Materials Science and Engineering, Shanghai University, 149 Yanchang Rd, Shanghai, China,School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai 200240, China,State Key Laboratory of Advanced Special Steel Shanghai University, Shanghai, China;

    School of Materials Science and Engineering, Shanghai University, 149 Yanchang Rd, Shanghai, China,State Key Laboratory of Advanced Special Steel Shanghai University, Shanghai, China;

    School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai 200240, China;

    School of Materials Science and Engineering, Shanghai University, 149 Yanchang Rd, Shanghai, China,State Key Laboratory of Advanced Special Steel Shanghai University, Shanghai, China;

    School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai 200240, China;

    State Key Lab of Development and Application Technology of Automotive Steels, Baosteel Research Institute, Shanghai 201900, China;

    State Key Lab of Development and Application Technology of Automotive Steels, Baosteel Research Institute, Shanghai 201900, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fracture resistance; Quenched and partitioned (QP); Dual phase steel (DP); Double edge notched (DEN); Stress triaxiality;

    机译:耐断裂性淬火和分区(Q&P);双相钢(DP);双刃缺口(DEN);应力三轴性;

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