正火工艺对含钛焊缝组织及性能的影响
Effects of Normalizing Process on Microstructure and Properties of Titanium-containing Welding Joint
邓汉忠1, 贾英辉2, 杨 森
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作者单位：(1.辽宁工程技术大学 材料科学与工程学院, 辽宁 阜新 123000; 2.辽宁工程技术大学 矿业技术学院, 辽宁 葫芦岛 125105)
中文关键字：含钛焊缝； 碳化物； 晶粒细化； 热处理
英文关键字：titanium-containing welding joint; carbide; grain refinement; heat treatment
中文摘要：通过正火工艺参数的变化研究了含钛焊缝组织及性能的变化。结果表明，采用NB-1SJ焊条焊接后，焊缝组织为下贝氏体 ＋ 弥散碳化物 ＋ 少量残余奥氏体；经不同温度正火处理后，焊缝组织变为铁素体 ＋ 碳化物，且冲击韧度明显增加。在930℃下保温 2 h后，焊缝金属的韧性最好；经1190 ℃正火处理后，焊缝区碳化物TiC会大量固溶，细晶强化作用减弱，晶粒有所长大，韧性下降。
英文摘要：The evolution of the microstructure and properties of titanium-containing welded joint during normalizing process was investigated. The results show that weld microstructure has lower bainite, disperse carbide and a small amount of residual austenite after using the NB-1SJ electrode welding. By different temperature normalizing, the weld microstructure changes to ferrite and carbide, impact toughness increases significantly . The toughness of weld metal is the best after normalizing at 930 ℃ for 2 h; by normalizing at 1190 ℃for 2 h, the solidsolution of the TiC in welding zero appears, the effect of fine grain strengthening decreases obviously, grain becomes bigger obviously, toughness decreases.