低合金高强钢焊接t_(8/5)测定实验研究  

Experimental study of welding t_(8/5) of low alloy and high strength steel

作　　者：曾威民 张波 刘旭辉[1] 肖爱达[1] 欧玲 ZENG Weimin;ZHANG Bo;LIU Xuhui;XIAO Aida;OU Ling(Lianyuan Iron and Steel Co. Ltd., Loudi 417009,Hunan, China;School of Metallurgical Engineering, Hunan Unversity of Technology, Zhuzhou 412000, Hunan, China)

机构地区：[1]湖南华菱涟源钢铁有限公司技术中心,湖南娄底417009 [2]湖南工业大学冶金与材料工程学院,湖南株洲412000

出　　处：《四川冶金》2019年第2期7-10,14,共5页Sichuan Metallurgy

摘　　要：t_(8/5)的选择对低合金高强钢焊接性能的影响非常重要,但目前的经验公式均具有一定的适用范围,难以做到与每个钢种均能很好吻合。为此,在MMS-200热力模拟试验机上进行了焊接热模拟试验,对960高强钢的SHCCT曲线进行了测定。采用多个经验公式对不同热输入条件下的t_(8/5)进行计算,同时以实测方式得到t_(8/5)值,根据实测值对经验公式进行修正,建立了960钢焊接线能量与t_(8/5)的关系公式。在对比实验中发现,t_(8/5)为30s时热模拟粗晶区和实际焊接接头(E=1.3kJ/mm)粗晶区组织及硬度是一致的。The t 8/5 is very important to the welding performance of low-alloy and high-strength steel, but the current empirical formulas all have a little scope of application, which is difficult to achieve a good agreement with each type of steel. For this reason, the welding thermal simulation test on MMS-200 thermal simulation test machine, and measured the SH-CCT of 960 high strength steel. At the same time, the actual value of t 8/5 was obtained by experimental. According to the measured value, the empirical formula was modified to establish the relation formula between the energy of 960steel welding line and t 8/5 . In the comparison experiment, it was found that the microstructure and hardness of the rough crystal area in thermal simulation at t 8/5 is 30 s and the actual welding joint (E=1.3 kj /mm) were consistent.

关 键 词：热影响区 SH-CCT曲线 t8/5 

分 类 号：TG457.11[金属学及工艺—焊接]