首页|Nb-Ti、V-Ti微合金化对2 GPa热成型钢折弯与氢致延迟开裂性能的影响

Nb-Ti、V-Ti微合金化对2 GPa热成型钢折弯与氢致延迟开裂性能的影响

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为研究实际工业应用中不同微合金化方式对2 GPa热成型钢折弯性能和氢致延迟开裂性能的影响,在模具热冲压后,对采用Nb-Ti和V-Ti两种微合金化方式的2 GPa热成型钢的上述能进行了表征.结果表明:Nb-Ti微合金钢的折弯与氢致延迟开裂性能要优于V-Ti微合金钢,无镀层微合金钢的折弯与氢致延迟开裂性能要显著优于铝硅镀层钢;与V-Ti微合金化相比,Nb-Ti微合金化的细晶作用、更加细小的析出物尺寸、片状或细条状的析出物形貌、淬火后马氏体的特殊亚结构均有利于提高2 GPa热成型钢的折弯与氢致延迟开裂性能;铝硅镀层硬而脆的特征与对氢扩散的"封闭"作用,削弱了铝硅镀层钢的折弯与氢致延迟开裂性能.
Effect of Nb-Ti and V-Ti nicroalloying on bending and hydrogen-induced delayed cracking properties of 2 GPa hot stamping steel
In order to study the effects of different microalloying methods on the bending properties and hydrogen-induced delayed cracking properties of 2 GPa hot stamping steel in practical industrial applications,the above properties of Nb-Ti and V-Ti micro-alloyed 2 GPa hot stamping steels were characterized.The results show that the bending and hydrogen-induced delayed cracking properties of Nb-Ti microalloyed steel are better than those of V-Ti microalloyed steel,and the bending and hydrogen-induced delayed cracking properties of non-coated microalloyed steel are significantly better than those of aluminum-silicon coated steel.Compared to V-Ti microalloying,the refined crystalline strengthening,the precipitates with finer size,the morphology of the precipitates in sheets or strips,and the special substructure of quenched martensite of Nb-Ti microalloying are all beneficial to bending and hydrogen-induced delayed cracking properties of 2 GPa hot stamping steel.The hard and brittle properties of alumi-num-silicon coating and the"sealing"effect on hydrogen diffusion weaken the bending and hydrogen-induced delayed cracking properties of aluminum-silicon coated steel.

hot stamping steelNb-Ti microalloyingV-Ti microalloyingbending propertyhydrogen-induced delayed cracking propertysecond phase precipitate

杨峰、李杨、王朝、路洪洲、汪健、桂林涛

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唐山钢铁集团有限责任公司技术中心,河北 唐山 063016

中信金属股份有限公司,北京 100004

北京理工大学重庆创新中心装备轻量化技术研究所,重庆 401120

热成型钢 Nb-Ti微合金化 V-Ti微合金化 折弯性能 氢致延迟开裂性能 第二相析出物

中国博士后科学基金项目重庆市自然科学基金博士后科学基金项目中信集团重大科技创新项目

2022M710399cstc2021jcyjbshX00032022ZXKYA06100

2024

10.13228/j.boyuan.issn1003-9996.20240211

轧钢
中国钢研科技集团有限公司

轧钢

CSTPCD北大核心
影响因子：0.881
ISSN：1003-9996
年,卷(期)：2024.41(2)
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