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借助SEM,EBSD等显微组织分析手段及力学性能测试,研究了集装箱船用EH47级别高止裂韧性钢的显微组织与力学性能的关系。实验结果表明,针状铁素体+贝氏体的组织可满足集装箱船用EH47级别高止裂韧性钢对止裂韧性性能的严格要求。晶粒尺寸细小的针状铁素体+贝氏体相互配合具有较高的强度、止裂韧性性能;增大针状铁素体晶粒尺寸或引入多边形铁素体过多则会降低材料强度;而贝氏体体积分数过多、晶粒尺寸过大时,材料塑性和止裂韧性性能显著降低。
With SEM, EBSD and other microstructure analysis means and mechanical properties of the test, the relationship between the microstructure and mechanical properties of EH47 grade high ultimate strength steel was studied. The experimental results show that the microstructure of acicular ferrite + bainite can meet the strict requirements of crack arrestability of EH47 grade high ultimate strength steel for container ships. The fine grain size of acicular ferrite + bainite with high strength, crack toughness performance; increased acicular ferrite grain size or the introduction of polygonal ferrite will reduce the material strength ; While the bainite volume fraction is too large, the grain size is too large, the material plasticity and the crack arrest toughness performance significantly reduced.