钒微合金钢粗晶热影响区的组织和韧性

doi:10.13228/j.boyuan.issn0449-749x.20140459

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摘要利用Gleeble-3800模拟焊接粗晶热影响区（CGHAZ）经历的热循环过程。比较了热输入100 kJ/cm条件下，V钢、V-N钢、V-Ti钢和V-N-Ti钢CGHAZ的组织和韧性，并分析了析出相情况。结果表明，CGHAZ的韧性从高到低依次为V-N-Ti钢、V-Ti钢、V-N钢和V钢；在V钢成分基础上添加钛可以有效细化原始奥氏体晶粒尺寸；V-Ti钢成分基础上增氮，一方面促进了（Ti，V）（C，N）/TiN的析出，抑制了原始奥氏体晶粒的粗化；另一方面促进了V（C，N）的析出，其促进了多边形铁素体的形成；多边形铁素体数量的增加能够减弱自由氮对韧性的破坏，同时有效改善了CGHAZ韧性。

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	师仲然
	王瑞珍
	王青峰
	苏航
	柴锋
	杨才福

关键词 ：钒微合金钢, 粗晶热影响区, 氮, 多边形铁素体, 韧性

Abstract：Using the Gleele-3800 to simulate the thermal cycling process of coarse grained heat affected zone （CGHAZ）. When the weld heat input was 100 kJ/cm， comparing the CGHAZ microstructure and toughness of V steel， V-N steel， V-Ti steel， V-N-Ti steel， analyzed the vanadium and titanium carbon precipitation. The results show that the order of CGHAZ toughness from high to low is V-N-Ti steel， V-Ti steel， V-N steel and V steel; Adding Ti to V steel can effectively decrease the original austenite size; On one hand， increasing the nitrogen based on the V-Ti steel can promote the （Ti，V）（C，N）/TiN formed which can decrease the austenite size. On the other hand， increasing the nitrogen can promote the V（C， N） formed which can promote the polygonal ferrite formed. The polygonal ferrite can partly remedy the detrimental effect of the free N atoms and improve the CGHAZ toughness.

收稿日期: 2014-07-29 出版日期: 2015-04-13

PACS:

TG113.26

引用本文:

师仲然，王瑞珍，王青峰，苏航，柴锋，杨才福. 钒微合金钢粗晶热影响区的组织和韧性[J]. 钢铁, 2015, 50(4): 70-75. SHI Zhong-ran，WANG Rui-zhen，WANG Qing-feng，，SU Hang，CHAI Feng，YANG Cai-fu. Microstructures and toughness of simulated CGHAZ of vanadium microalloyed steel. Iron and Steel, 2015, 50(4): 70-75.

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