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Comparison of testing of susceptibility to solidification cracking of ferritic stainless steels using two methods
Welding in the World ( IF 2.1 ) Pub Date : 2020-04-10 , DOI: 10.1007/s40194-020-00888-1 D. S. Konadu , P. G. H. Pistorius
Welding in the World ( IF 2.1 ) Pub Date : 2020-04-10 , DOI: 10.1007/s40194-020-00888-1 D. S. Konadu , P. G. H. Pistorius
The susceptibility to solidification cracking of unstabilized and stabilized ferritic stainless steels was investigated using self-restrained Houldcroft and Modified Varestraint-Transvarestraint (MVT) tests. Nine steel grades of unstabilized and stabilized ferritic stainless steels were used in this study. Seven steels comprising an unstabilized, two monostabilized (Ti and Nb) respectively, three dual stabilized (Ti + Nb), and a dual stabilized containing Mo were used for the self-restrained Houldcroft method. A monostabilized Nb and dual stabilized (Ti + Nb) grades (experimental alloys) and commercial grades of an unstabilized and a dual stabilized (Ti + Nb) ferritic stainless steels were employed in the MVT test. Autogenous gas tungsten arc welding at a speed of 6 mm/s, 3 mm/s, and 1 mm/s was done for the Houldcroft test and welding at a speed of 6 mm/s and 3 mm/s for MVT test. The results of the tests were evaluated by measuring the crack length, considering the microstructure and using multiple linear regression analysis of the crack length. The MVT method was successful in demonstrating the deleterious effect of Nb on ferritic stainless steels. Cracking of the Houldcroft samples was dependent on Ti, welding parameters, and the weld bead geometry.
中文翻译:
两种方法对铁素体不锈钢凝固裂纹敏感性测试的比较
使用自约束的Houldcroft和改进的Varestraint-Transvarestraint(MVT)试验研究了不稳定和稳定的铁素体不锈钢的凝固裂纹敏感性。本研究使用了九种钢种的未稳定和稳定的铁素体不锈钢。自约束Houldcroft方法使用了七种钢,分别包括未稳定的,两种单稳定的(Ti和Nb),三种双稳定的(Ti + Nb)和双稳定的Mo。在MVT测试中,使用了单稳定Nb和双稳定(Ti + Nb)等级(实验合金)和商业等级的未稳定和双稳定(Ti + Nb)铁素体不锈钢。自生气体钨极电弧焊速度为6 mm / s,3 mm / s,对于Houldcroft测试,速度为1 mm / s,对于MVT测试,速度为6 mm / s和3 mm / s。通过测量裂纹长度,考虑微观结构并使用裂纹长度的多元线性回归分析来评估测试结果。MVT方法成功地证明了Nb对铁素体不锈钢的有害作用。Houldcroft样品的开裂取决于Ti,焊接参数和焊缝几何形状。
更新日期:2020-04-10
中文翻译:
两种方法对铁素体不锈钢凝固裂纹敏感性测试的比较
使用自约束的Houldcroft和改进的Varestraint-Transvarestraint(MVT)试验研究了不稳定和稳定的铁素体不锈钢的凝固裂纹敏感性。本研究使用了九种钢种的未稳定和稳定的铁素体不锈钢。自约束Houldcroft方法使用了七种钢,分别包括未稳定的,两种单稳定的(Ti和Nb),三种双稳定的(Ti + Nb)和双稳定的Mo。在MVT测试中,使用了单稳定Nb和双稳定(Ti + Nb)等级(实验合金)和商业等级的未稳定和双稳定(Ti + Nb)铁素体不锈钢。自生气体钨极电弧焊速度为6 mm / s,3 mm / s,对于Houldcroft测试,速度为1 mm / s,对于MVT测试,速度为6 mm / s和3 mm / s。通过测量裂纹长度,考虑微观结构并使用裂纹长度的多元线性回归分析来评估测试结果。MVT方法成功地证明了Nb对铁素体不锈钢的有害作用。Houldcroft样品的开裂取决于Ti,焊接参数和焊缝几何形状。