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首页> 外文期刊>Materials Science and Engineering >The relationships of microstructure-mechanical properties in quenching and partitioning (Q&P) steel accompanied with microalloyed carbide precipitation
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The relationships of microstructure-mechanical properties in quenching and partitioning (Q&P) steel accompanied with microalloyed carbide precipitation

机译：Q＆P钢与微合金碳化物析出的组织与力学性能的关系

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摘要

A low carbon steel microalloyed with Nb-V-Ti were heat treated by means of two-step quenching and partitioning (Q&P) process after partial austenitization. Combined use of SEM equipped with EBSD, XRD and TEM showed that the microstructure was composed of intercritical polygonal ferrite, tempered lath martensite, secondary twin martensite and carbon-enriched retained austenite, as well as microalloyed carbides (mainly VC) precipitated inside ferrite and martensite. When increasing partitioning time from 0 s to 3600 s, the volume fraction of retained austenite increased up to 6.5% with mean carbon content in austenite keeping a constant level. The retained austenite kept K-S orientation relationship with adjacent tempered lath martensite and neighboring secondary twin martensite in different martensite packet. As partitioning time increased up to 3600 s, the initial lath martensite tempered gradually to ferrite without any cementite formation.
机译：在部分奥氏体化之后，通过两步淬火和分配（Q＆P）工艺对采用Nb-V-Ti微合金化的低碳钢进行热处理。配备EBSD，XRD和TEM的SEM的结合使用表明，显微组织由临界多角形铁素体，回火板条马氏体，二次孪晶马氏体和富碳残余奥氏体以及沉淀在铁素体和马氏体内部的微合金碳化物（主要是VC）组成。 。当分配时间从0 s增加到3600 s时，残余奥氏体的体积分数增加到6.5％，奥氏体中的平均碳含量保持恒定。残余奥氏体与不同回火马氏体组中相邻的回火板条马氏体和相邻的次生双马氏体保持K-S取向关系。随着分配时间增加到3600 s，初始板条马氏体逐渐回火为铁素体，而未形成渗碳体。

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