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首页> 美国政府科技报告 >Factors Affecting the Strength and Toughness of Low Carbon Alloy Steel Weld Metal
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Factors Affecting the Strength and Toughness of Low Carbon Alloy Steel Weld Metal

机译：影响低碳合金钢焊缝金属强度和韧性的因素

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This report details a metallurgical analysis which identifies the factors affecting the strength and toughness behavior of newly developed low carbon welding consumables. It was found that the 50% transformation temperature (T50) was a good indicator of the microstructure type and was successfully correlated to weld deposit strength. Other factors responsible for strength development were prior austenite grain width (gamma sub gw), cooling rate, muitipass reheating, carbon content and oxygen. The factors responsible for toughness development (-51 deg C) were the yield to ultimate strength ratio, cooling rate, oxygen and carbon contents. The austenite grain width and 50% transformation temperature were modeled from welding parameters and weld deposit composition, permitting successful prediction of weld metal strength and toughness. The optimum weld deposit compositions as determined by the model was 0.04% C, 0.60% Mo, 2.4% Ni, and 0.4% Si if the oxygen content was 200 ppm, and 0.04% C, 0.60% Mo, 2.6% Ni, and 0.4% Si if the oxygen content was 250 ppm.

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