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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Ti and B Addition on Microstructures and Mechanical Properties of Hot-Rolled High-Strength Nb-Containing Steels
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Effects of Ti and B Addition on Microstructures and Mechanical Properties of Hot-Rolled High-Strength Nb-Containing Steels

机译：钛和硼的添加对热轧高强度含铌钢组织和力学性能的影响

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摘要

Four microalloyed samples were designed to study the effects of Ti and B additions on microstructures and mechanical properties. Experimental results show that the samples without B addition mainly contain well-developed pearlite and polygonal ferrite, whereas the B-containing samples consist of degenerated pearlite, polygonal ferrite, and Widmanstatten ferrite (WF). The B addition promotes the precipitation of the complex (Ti,Al,Nb)N and (Ti,Al,Nb)(2)CS phases during the hot-rolling process. Grain sizes are significantly refined by the combinations of undissolved (Ti,Al)N, (Ti,Al,Nb)N complex, (Ti,Al,Nb)(2)CS, and fine inclusions, which act as the nucleation sites of intragranular ferrite. The core of complex (Ti,Al,Nb)N precipitate is undissolved Ti-N-rich (Ti,Al)N phase, and the cap is Nb-N-rich (Nb,Ti)N phase. The property measurements show that the B addition enhances comprehensive properties of tensile strength and elongation, but decreases fracture toughness due to higher contents of the WF and subgrains.
机译：设计了四个微合金样品，以研究Ti和B的添加对微结构和力学性能的影响。实验结果表明，不含B的样品主要含有发达的珠光体和多边形铁素体，而含B的样品则由变性珠光体，多边形铁素体和Widmanstatten铁素体（WF）组成。 B的添加促进了热轧过程中（Ti，Al，Nb）N和（Ti，Al，Nb）（2）CS复合物的沉淀。通过不溶性（Ti，Al）N，（Ti，Al，Nb）N络合物，（Ti，Al，Nb）（2）CS和细小夹杂物的组合显着细化晶粒尺寸晶内铁素体。复杂的（Ti，Al，Nb）N沉淀的核心是未溶解的富Ti-N的（Ti，Al）N相，而盖层是富Nb-N的（Nb，Ti）N相。性能测量表明，B的添加增强了拉伸强度和伸长率的综合性能，但由于WF和亚晶粒含量较高，降低了断裂韧性。

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