高氮高钼合金连铸表面裂纹原因分析

doi:10.13228/j.boyuan.issn1005-4006.20210063

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Abstract S31254 is a super austenitic stainless steel(SASS), which contains a large amount of alloying elements such as Cr, Ni, Mo, N and Cu, and has excellent corrosion resistance and comprehensive mechanical properties. At present, the main problem of S31254 alloy continuous casting is surface crack. By studying the material properties, thermal simulation fracture mechanism and in-situ observation of solidification of S31254 alloy, the cause of crack defect of S31254 was analyzed by metallographic microscope and scanning electron microscope. The results show that there are a large number of precipitates in the as-cast grain boundary of S31254 alloy. The precipitates include Sigma phase (σ), Chi phase (χ), Laves-phase and nitrides etc. The precipitates are characterized by rich Cr and Mo and poor Ni. When the temperature rises to about 1 240 ℃, all precipitates melt into austenite phase, and the final molten precipitates are σ phase. As the precipitated phase of S31254 alloy precipitates along the grain boundary, the as-cast grain boundary becomes brittle, and the fracture mechanism of the cast billet specimen changes into the brittle fracture along the grain boundary, which reduces the high temperature plasticity of the alloy and increases the tendency to crack.

Key words： surface crack precipitated phase brittle fracture high-temperature ductility S31254 alloy continuous casting

Received: 31 May 2021

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	Articles by authors
	GUO Liang-liang
	WANG Ying-chun
	XU Guo-dong

Cite this article:

GUO Liang-liang,WANG Ying-chun,XU Guo-dong. Analysis of surface cracking mechanism of high nitrogen and molybdenum alloy continuous casting[J]. CONTINUOUS CASTING, 2021, 40(4): 26-30.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20210063 OR http://www.chinamet.cn/Jweb_lz/EN/Y2021/V40/I4/26

[1]	Schmida A,Moria G,Hönigb S,et al. Comparison of the high-temperature chloride-induced corrosion between duplex steel and Ni based alloy in presence of H2S[J].Corrosion Science,2018,139:76.
[2]	WANG J,CUI Y S,BAI J G,et al. Effect of B addition on the microstructure and corrosion resistance of S31254 super austenitic stainless steels after solid solution treatment[J].Materials Letters,2019,252:60.
[3]	ZHANG H C,JIANG Z H,LI H B,et al. Precipitation behavior and phase transformation mechanism of super austenitic stainless steel S32654 during isothermal aging[J].Materials Characterization,2018,137:244.
[4]	Ding W J,Bonk A,Bauer T. Corrosion behavior of metallic alloys in molten chloride salts for thermal energy storage in concentrated solar power plants:a review[J].Frontiers of Chemical Science and Engineering,2018,12:564.
[5]	ZHANG Y,YIN X Y,YAN F Y. Tribocorrosion behaviour of type S31254 steel in seawater identification of corrosion-wear components and effect of potential[J].Materials Chemistry and Physics,2016,179:273.
[6]	HAN Y,WU H,ZHANG W. Constitutive equation and dynamic recrystallization behavior of as-cast 254SMO super-austenitic stainless steel[J].Materials and Design,2015,69(3):230.
[7]	杨峥,牟祖茂. 超高温激光共聚焦显微镜在显微组织相变研究中的应用[J].安徽冶金,2018(1):37.
[8]	张志锋,白银,吕知清,等. TP347H钢固溶过程中组织演变的原位表征[J].钢铁,2018,53(3):57.
[9]	赵显久,温宏权,张捷宇. 连铸结晶器保护渣物相性能研究[J].现代冶金,2019,47(3):46.
[10]	Seol D J,Won Y M,Yeo T J,et al. High temperature deformation behavior of carbon steel in the austenite and δ-ferrite regions[J].ISIJ International,1999,39(1):9.
[11]	曹晓恩,程迪,武志杰,等. 汽车用高强度钢CR1030/1300MS连铸板坯的热塑性[J].特殊钢,2018,39(3):1.
[12]	杨小刚,张立峰,任英,等. 含钛微合金钢的高温热塑性及断裂机理[J].工程科学学报,2016,38(6):805.
[13]	朱苗勇. 新一代高效连铸技术发展思考[J].钢铁,2019,54(8):21.
[14]	张磊,翟冰钰,王万林. 薄板坯连铸及其铸坯表面缺陷的形成机理[J].连铸,2020(4):22.
[15]	孙丽钢,贾生,李鑫. 宽厚板连铸坯表面裂纹的产生原因及控制[J].连铸,2020(4):70.
[16]	汪杰,吴保桥,张建,等. Nb-V、Nb-Ti对重型热轧H型钢强韧性的影响[J].中国冶金,2020,30(11):47.
[17]	卢凤飞,杨云清. 利用Nb微合金化及柔性轧制工艺生产低合金Q355B中厚钢板[J].河北冶金,2021(4):47.
[18]	张新文,江宏亮,轩康乐,等. 热轧圆钢Q345E表面裂纹的研究与控制[J].中国冶金,2021,31(4):44.
[19]	卢锐,高野,李志峰,等. 热变形对微合金高强钢Q890D连续冷却相变的影响[J].河北冶金,2021(4),18.