Ti和B对耐候焊丝钢连续相转变行为和强度的影响

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摘要通过Gleeble热模拟方法研究了Ti和B对耐候焊丝钢的CCT行为影响规律。组织分析表明：在冷却速度为0.1~1℃/s时，将Ti质量分数从0.05%增加到0.10%后，相转变的开始和结束温度分别降低12和37℃，同时组织中TiN颗粒数量增加，也将产生M-A组元的临界冷却速度从0.5℃/s降低到0.2℃/s；继续添加0.002% B会进一步将相转变的开始和结束温度分别降低约26和60℃，同时增加相转变组织中的M-A组元的体积含量和尺寸，也将产生M-A组元的临界冷却速度从0.2℃/s降低到0.1℃/s。硬度数据表明：把Ti质量分数从0.05%增加到0.10%后，盘条强度增加约56MPa；继续添加质量分数0.002%的B后，盘条强度将再增加78MPa。

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	许红梅
	张宇
	潘鑫
	王银柏

Abstract：Effect of Ti and B on continuously cooled transformation behavior of weather resistant welding wire steel was investigated by thermal simulation on Gleeble. The results show that, under cooling rates between 0.1 and 1℃/s, increasing titanium content from 0.05% to 0.1% would decrease the start and finish temperature of phase transformation by 12 and 37℃, respectively, as well as increasing the quantities of TiN and decreasing the critical cooling rate for producing M-A constituent from 0.5 to 0.2℃/s. With further addition of 0.002% boron, the start and finish temperature of phase transformation is decreased by 26 and 60℃, also the size and volume fraction of M-A constituents increases and the critical cooling rate for producing M-A constituents is further decreased to 0.1℃/s. Hardness results suggested that tensile strength would improve 56MPa when titanium content increased from 0.05% to 0.1%, and it would further improve 78MPa with addition of 0.002% boron.

收稿日期: 2012-12-25 出版日期: 2013-10-14

PACS:

TG142.1

引用本文:

许红梅，张宇，潘鑫，王银柏. Ti和B对耐候焊丝钢连续相转变行为和强度的影响[J]. 钢铁, 2013, 48(10): 50-56. XU Hong-mei,ZHANG Yu,PAN Xin,WANG Yin-bai. Effect of Ti and B on Continuous Cooling Transformation Behavior and Strength of Weather Resistant Welding Wire Steel. Iron and Steel, 2013, 48(10): 50-56.

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http://www.chinamet.cn/Jweb_gt/CN/ 或 http://www.chinamet.cn/Jweb_gt/CN/Y2013/V48/I10/50

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