微钛处理对钒氮微合金H型钢组织性能影响  

Effect of Micro Titanium Treatment on Microstructure and Properties of V-N Microalloyed H Section Steel

作　　者：杨栋 李超 Yang Dong;Li Chao(Laiwu Branch of Shandong Iron&Steel Co.,Ltd.,Laiwu Shandong 271104)

机构地区：[1]山东钢铁股份有限公司莱芜分公司,山东济南271104

出　　处：《山西冶金》2022年第8期1-2,29,共3页Shanxi Metallurgy

摘　　要：对山钢股份莱芜分公司生产的钒氮微合金钢以及微钛处理钒氮微合金钢进行拉伸、冲击等力学性能试验,并进行微观组织的检验,研究微钛处理对钒氮微合金钢组织与力学性能的影响。试验结果表明,钒氮微合金化钢经微钛处理后,因钛与氮的优先结合,降低了与钒结合的氮含量,抑制了V(C,N)的析出量,导致屈服强度、抗拉强度降低,高温未溶的TiN粒子可在加热过程中起到钉扎奥氏体晶界的作用,抑制了奥氏体晶粒高温条件下的长大行为,显著提高了晶粒粗化温度,细化了原始奥氏体晶粒组织,并最终实现了轧后组织的晶粒细化改善,提高了耐低温冲击性能。The tensile,impact and other mechanical properties of vanadium nitrogen microalloyed steel and micro titanium treated vanadium nitrogen microalloyed steel produced by Laiwu Branch of Shandong Iron and Steel Co.,Ltd.were tested,and the microstructure was inspected to study the effect of micro titanium treatment on the microstructure and mechanical properties of vanadium nitrogen microalloyed steel.The test results show that the vanadium nitrogen microalloyed steel after micro titanium treatment,due to the preferential combination of titanium and nitrogen,reduces the nitrogen content combined with vanadium,inhibits the precipitation of V(C,N),resulting in lower yield strength and tensile strength.The high-temperature undissolved TiN particles can play a role in pinning the austenite grain boundary during the heating process,inhibit the growth behavior of austenite grains at high temperatures,and significantly increase the grain coarsening temperature.The original austenite grain structure is refined,and finally the grain refinement of the rolled structure is improved,and the low temperature impact resistance is improved.

关 键 词：钒氮微合金化 微钛处理 力学性能 析出物 

分 类 号：TG142.1[一般工业技术—材料科学与工程]