铌、钛对汽车排气系统热端用铁素体不锈钢高温力学性能的影响

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摘要对含铌及Nb-Ti铁素体不锈钢进行固溶和高温时效处理，采用高温拉伸试验对其进行高温力学测试。结果表明：随着时效时间的延长，铌钢高温屈服强度降低较快，而Nb-Ti钢高温屈服强度变化不大。采用相分析、扫描电镜、透射电镜对固溶铌及微观结构进行分析，发现时效过程中固溶铌含量均降低，含铌及Nb-Ti钢500h时效后固溶铌相差不大，铌钢中析出相主要是NbN相和Ｍ6C相（Fe3Nb3C），Ti-Nb钢主要析出相是NbTi（C，N）相和Laves相（Fe2Nb）。长时间时效后，Ｍ6C相和Laves相严重粗化且分布变化明显。Ｍ6C相粗化后观察不到沿晶界连续分布，而Laves相粗化后主要在晶界连续分布，起到强化晶界的作用。

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	董志刚

关键词 ：（铁素体不锈钢）（沉淀相）（高温强度）

Abstract：After high temperature solid solution and aging treatment for containing Nb and Nb-Ti ferritic stainless steel, its high temperature mechanical properties were tested by high-temperature tensile test. The results show that the heat-yield strength of Nb steel decreases faster with extended aging time; however, there is little change for high-temperature yield strength of Nb-Ti steel. Solid solution Nb and microscopic structure was analyzed by phase analysis, scanning electron microscopy and transmission electron microscopy. It is found that the solid solution Nb content decreases during aging, and after aging 500h, the difference of solid solution niobium between Nb and Nb-Ti steel is not significant. The precipitation phase of Nb steel is mainly NbN and M6C phase (Fe3Nb3C), but the precipitation phase of Nb-Ti steel is mainly NbTi(C,N) and Laves phase (Fe2Nb). After long time aging, distribution of the coarsening M6C and Laves phase are significantly different. M6C phase distribution along the grain boundary is not obvious, while Laves phase mainly in the continuous distribution at grain boundaries, grain boundaries play a role in drag.

收稿日期: 2012-02-09 出版日期: 2013-02-27

引用本文:

董志刚，陈海涛，郎宇平，项金钟. 铌、钛对汽车排气系统热端用铁素体不锈钢高温力学性能的影响[J]. 钢铁, 2013, 48(2): 64-68. DONG Zhi-gang,,CHEN Hai-tao,LANG Yu-ping,XIANG Jin-zhong. Effect of Ti and Nb on High Temperature Mechanical Property of Ferritic Stainless Steel Used for Hot End of Automotive Exhaust System. Iron and Steel, 2013, 48(2): 64-68.

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http://www.chinamet.cn/Jweb_gt/CN/ 或 http://www.chinamet.cn/Jweb_gt/CN/Y2013/V48/I2/64

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