Microstructure Evolution and Mechanical Behavior of a CMnSiAl TRIP Steel Subjected to Partial Austenitization Along with Quenching and Partitioning Treatment
Microstructure Evolution and Mechanical Behavior of a CMnSiAl TRIP Steel Subjected to Partial Austenitization Along with Quenching and Partitioning Treatment
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DOI：
10.1007/s11661-018-4525-3
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
H. Kong;Q. Chao;M. Cai;E. Pavlina;B. Rolfe;P. Hodgson;H. Beladi
中科院分区：
文献类型：
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作者：
H. Kong;Q. Chao;M. Cai;E. Pavlina;B. Rolfe;P. Hodgson;H. Beladi
研究了低碳CMnSiAl相变诱导塑性（TRIP）钢在1183 K（910 °C）下进行部分奥氏体化，然后在不同等温保温温度[533 K ~ 593 K（260 °C ~ 320 °C）]下进行一步淬火配分（Q&P）处理后的组织演变和力学行为。该热处理导致形成由铁素体、回火马氏体、贝氏体铁素体、新鲜马氏体和残留奥氏体组成的多相显微组织，与双相显微组织（即，铁素体和马氏体）在部分奥氏体化之后接着水淬形成。残余奥氏体中碳的富集不仅与等温过程中的碳分配有关，而且与部分奥氏体化和快速冷却过程中的碳富集有关，拓宽了对传统Q&P工艺中碳分配机理的认识。
The present study investigated the microstructure evolution and mechanical behavior in a low carbon CMnSiAl transformation-induced plasticity (TRIP) steel, which was subjected to a partial austenitization at 1183 K (910 °C) followed by one-step quenching and partitioning (Q&P) treatment at different isothermal holding temperatures of [533 K to 593 K (260 °C to 320 °C)]. This thermal treatment led to the formation of a multi-phase microstructure consisting of ferrite, tempered martensite, bainitic ferrite, fresh martensite, and retained austenite, offering a superior work-hardening behavior compared with the dual-phase microstructure (i.e., ferrite and martensite) formed after partial austenitization followed by water quenching. The carbon enrichment in retained austenite was related to not only the carbon partitioning during the isothermal holding process, but also the carbon enrichment during the partial austenitization and rapid cooling processes, which has broadened our knowledge of carbon partitioning mechanism in conventional Q&P process.