钼对S30432耐热钢组织和性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20190449

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Abstract In order to confirm whether Mo should be added to domestic S30432 steel,the effect and mechanism of 0.32% Mo addition on the microstructure and properties of S30432 heat-resistant steel were studied. SEM,TEM and Thermo-Calc software were used to study the influence of 0.32% Mo on the precipitates and matrix in S30432 steel. The effect of Mo on the mechanical properties of S30432 steel at high temperature was studied by instantaneous tensile test and creep rupture test at 650 ℃. The pitting corrosion resistance and intergranular corrosion resistance of Mo-free and Mo-containing S30432 were evaluated by electrochemical experiment. The results show that the addition of Mo is beneficial to the mechanical properties at high temperature and corrosion resistance of S30432 steel. Adding 0.32%Mo to S30432 steel improves the yield strength and tensile strength at 650 ℃,prolongs the creep rupture time of short-term creep at high temperature and increases the hardness. However,the effect of Mo on the improvement in strength of S30432 steel is not obvious after long-term creep. Compared with Mo-free steel,the self-corrosion potential and pitting rupture potential of Mo-containing S30432 steel are higher and the susceptibility of intergranular corrosion is lower. Corrosion morphology observation shows that there are fewer pitting pits with smaller size in the Mo-containing steel,and intergranular corrosion is less serious.

Key words： Mo S30432 steel pitting intergranular corrosion

Received: 08 October 2019

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	KE Zhi-gang
	ZHU Li-hui
	ZHOU Ren-yuan
	ZHAI Guo-li

Cite this article:

KE Zhi-gang,ZHU Li-hui,ZHOU Ren-yuan等. Effect of Mo on microstructure and properties of S30432 heat-resistant steel[J]. Iron and Steel, 2020, 55(7): 92-99.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190449 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I7/92

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