王孙中,彭兴东,张鹏,刘磊,邢玉杰

• 1:辽宁科技大学材料与冶金学院
• 2:海洋装备用金属材料及其应用国家重点试验室

摘要(Abstract)：

采用电子背散射衍射(EBSD)和扫描电镜(SEM)分析了正火工艺处理的EH36船板钢织构、再结晶和疲劳断口。并通过拉伸试验、疲劳裂纹扩展速率试验、疲劳断裂韧性试验及数值模拟等研究了正火工艺处理的EH36船板钢的疲劳裂纹扩展行为、疲劳断裂机理以及外载和应力比对应力强度因子幅值的影响。结果表明：EH36船板钢具有较强的{110}和{111}塑性织构成分，平均晶粒尺寸为8.2μm,变形晶粒所占比例为4.1%,伸长率为33.3%。通过双对数线性拟合得到应力比为0.03和0.1下的疲劳裂纹扩展寿命预测公式分别为da/dN=1.07×10~(-9)(ΔK)~(3.49)和da/dN=1.96×10~(-9)(ΔK)~(3.35)。通过J积分法计算出正火处理的EH36船板钢的疲劳断裂韧性K_(J0.2BL(30))为387 MPa·m~(1/2)。试验钢的疲劳断裂机制是解理穿晶断裂和微孔生长聚合断裂的混合断裂机制。多参数模拟表明在最大外载一定时，相同疲劳裂纹长度下的应力强度因子幅值随着应力比的增加而减小；在疲劳裂纹长度与标准紧凑拉伸试样的长度比值为0.62时，可作为试验钢即将进入瞬断区的判据。

关键词(KeyWords)： EH36船板钢;正火;疲劳裂纹扩展速率;疲劳断裂韧性;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 辽科大—海洋装备用金属材料及其应用国家重点试验室联合基金(HGSKLUSTLN(2020)07)

作者(Author): 王孙中,彭兴东,张鹏,刘磊,邢玉杰

DOI: 10.13289/j.issn.1009-6264.2023-0057

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