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Orthogonal optimum design of parameters of flux used for low carbon bainitic steel
Applied Physics A ( IF 2.7 ) Pub Date : 2020-06-18 , DOI: 10.1007/s00339-020-03730-z Liang Yang , Hong Wang
Applied Physics A ( IF 2.7 ) Pub Date : 2020-06-18 , DOI: 10.1007/s00339-020-03730-z Liang Yang , Hong Wang
L 8 (2 7 ) orthogonal test table is applied to design eight kinds of flux, and arranged with SiO 2 , ZrO 2 and TiO 2 as three factors. The microstructure, morphology and mechanical properties of low carbon bainitic steels are investigated by means of optical microscope, scanning electron microscope, transmission electron microscope, tensile testing machine and instrumented drop weight impact tester with oscilloscope. The results indicate that the optimum composition rate is as follows: 20% SiO 2 , 10% ZrO 2 , and 6% TiO 2 , and the interaction between ZrO 2 and TiO 2 is obvious. The microstructure of deposited metal of low carbon bainitic steel is mainly formed by acicular ferrite and granular bainite. The acicular ferrite is paralleled distribution, and plenty of fine sheet Martensitic–Austenitic constituents are dispersing, which can hinder crack propagation and improve strength and toughness. The impact energy is up to 109.7 J at − 20 °C, and the ratio of brittle fracture termination load to maximum impact load is 0.378, ensuring excellent crack arrest toughness.
中文翻译:
低碳贝氏体钢焊剂参数正交优化设计
应用L 8 (2 7 )正交试验表设计8种助熔剂,以SiO 2 、ZrO 2 和TiO 2 三个因子排列。采用光学显微镜、扫描电镜、透射电镜、拉力试验机和带示波器的落锤冲击试验机对低碳贝氏体钢的显微组织、形貌和力学性能进行了研究。结果表明,最佳组成比例为:SiO 2 20%、ZrO 2 10%、TiO 2 6%,ZrO 2 与TiO 2 相互作用明显。低碳贝氏体钢熔敷金属组织主要由针状铁素体和粒状贝氏体组成。针状铁素体呈平行分布,大量细片状马氏体-奥氏体成分分散,能阻碍裂纹扩展,提高强度和韧性。- 20°C时冲击能量高达109.7 J,脆性断裂终止载荷与最大冲击载荷之比为0.378,保证了优异的止裂韧性。
更新日期:2020-06-18
中文翻译:
低碳贝氏体钢焊剂参数正交优化设计
应用L 8 (2 7 )正交试验表设计8种助熔剂,以SiO 2 、ZrO 2 和TiO 2 三个因子排列。采用光学显微镜、扫描电镜、透射电镜、拉力试验机和带示波器的落锤冲击试验机对低碳贝氏体钢的显微组织、形貌和力学性能进行了研究。结果表明,最佳组成比例为:SiO 2 20%、ZrO 2 10%、TiO 2 6%,ZrO 2 与TiO 2 相互作用明显。低碳贝氏体钢熔敷金属组织主要由针状铁素体和粒状贝氏体组成。针状铁素体呈平行分布,大量细片状马氏体-奥氏体成分分散,能阻碍裂纹扩展,提高强度和韧性。- 20°C时冲击能量高达109.7 J,脆性断裂终止载荷与最大冲击载荷之比为0.378,保证了优异的止裂韧性。