EFFECT OF BORON ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HOT-ROLLED Nb-ADDED HSLA H-SECTION STEEL
In our research, boron was added into the Nb-added high strength low alloy (HSLA) H-section steels. The contents of boron added were 4ppm, 8ppm and 11 ppm, respectively. The mechanical properties of H-section steels with/without boron were examined by using uniaxial tensile test and Charpy impact test (V-notch). The morphologies of the microstructure and the fracture surfaces of the impact specimens were observed by metalloscope, stereomicroscope and electron probe. The experimental results indicate that boron gives a significant increase in impact toughness, especially in low temperature impact toughness, though it leads to an unremarkable increase in strength and plasticity. For instance, the absorbed energy at -40℃ reaches up to 126J from 15J by 8ppm boron addition, and the ductile-brittle transition temperature declines by 20℃. It is shown that boron has a beneficial effect on grain refinement. The fracture mechanism is transited from cleavage fracture to dimple fracture due to boron addition.
Boron H-section steel microstructure mechanical properties
ZUOCHENG WANG GUOTAO CUI TAO SUN WEIMIN GUO XIULING ZHAO JUNQING GAO CHANGXING DONG
School of Materials Science and Engineering, Shandong University, Jinan, Peoples Republic of China Laiwu Iron and Steel Company Ltd., Laiwu, Peoples Republic of China
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
1885-1890
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）