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Morphological transformation of elongated MnS inclusions in non-quenched and tempered steel during isothermal heating

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Journal of Iron and steel Research International 2023年第3期30卷 525-536页

作者： Jun-yu Liu Cheng-song Liu Rui-juan Bai Wei Wang Qing-bo Wang Hua Zhang Hong-wei Ni The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and steelmaking Wuhan University of Science and TechnologyWuhan 430081HubeiChina Henan Jiyuan Iron&steel(Group)Co. Ltd.Jiyuan 459000HenanChina

Elongated MnS inclusions in rolled non-quenched and tempered steel tend to cause the mechanical anisotropy of steel,deteriorate the mechanical properties and degrade the quality and service life of the steel *** reveal the mechanisms of morphological transformation of strip-shaped MnS inclusions during isothermal heating,the effects of heat treatment time and temperature on the morphology,number density and size distribution of elongated MnS inclusions were systematically studied and discussed.A diffusion couple experiment was also conducted to clarify the diffusion mode of MnS *** experimental results showed that with the increase in isothermal heating time(from 0 to 10 h at 1473 K)and temperature(from 1173 to 1573 K for 3.0 h),the number density and average aspect ratio of MnS inclusions generally showed an increase and decrease trend,respectively,while the area fraction remained stable and only slightly fluctuated around 0.4%.In the diffusion couple,after the isothermal heating at 1473 K for 3.0 h,the elements Mn and S in the steel near the steel-MnS interface were very stable without any concentration *** morphology change sequence of the elongated MnS inclusions in the rolled non-quenched and tempered steel during the isothermal heating was strip→cylinderization→spindle→*** between the diameter of MnS inclusion and the spacing between two MnS inclusions after splitting,and the fitting goodness of different n values under different experimental time and temperature confirmed that the driving force for the transformation of MnS inclusions during the isothermal heating was surface diffusion,instead of volume diffusion.

关键词： non-quenched and tempered steel MnS inclusion Isothermal heating Surface diffusion Morphological transformation

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Effect of Nb-V Microalloying on Microstructures and Mechanical Properties of Medium Carbon non-quenched and tempered steel

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Journal of Iron and steel Research International 2011年第S1期18卷 779-784页

作者： CHENG Hui-jing 1,WANG Fu-ming 1,LI Chang-rong 2,ZHANG Bo 1,XIA Yun-jin 1 (1.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083 2.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083) Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

Based on optical microscope(OM),transmission electron microscope(TEM) and mechanical performance measurement,the microstructures and mechanical properties of Nb-V micro-alloying non-quenched and tempered steels have been *** results showed that the microstructure consists of ferrite and pearlite,in which there exists a lot of intragranular *** carbide is the main form of carbonitrides,Nb-enriched carbonitrides refine grains,V-enriched carbonitrides have precipitation strengthening effect,which promotes the toughness of the studied *** mechanical properties for steels 1,2 and 3 have met the standards required by high load automobile crankshaft,in which the comprehensive property for No.2 is the best.

关键词： non-quenched and tempered steel Nb-V microalloying strength and toughness-enhanced mechanism

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Research into Grinding Hardening of Microalloyed non-quenched and tempered steel

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Journal of China University of Mining and Technology 2007年第2期17卷 238-241页

作者： HAN Zheng-tong ZHANG Ning-ju GAO Ding YANG Gang College of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Department of Mechanical Engineering Wuxi Vocational School of Technology Wuxi Jiangsu 214006 China

Grinding hardening is a new technology of hardening steel piece surfaces with grinding heat generated in the grinding process instead of with a high or medium frequency induction heating method,which can effectively integrate grinding and surface hardening. Experimental studies were carried out on grinding hardening of non-quenched and tempered steel. Through grinding experiments with variable depths of cut and feeding rate,the variation in the depth of the hardening layer was studied and the microstructure of the hardening zone of the test pieces was subsequently ana-lyzed. In the end,the hardening effect of non-quenched and tempered steel was compared with that of 40Cr steel,which revealed the superiority of non-quenched and tempered steel in grinding hardening technology.

关键词： non-quenched and tempered steel 40Cr steel grinding surface hardening

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Control of Inclusions in 49MnVS3 non-quenched and tempered steel by Mg Treatment

Control of Inclusions in 49MnVS3 Non-Quenched and Tempered S...

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作者： Beibei Liu Hao Zhang Liangmei Zhong Yi Wang Jianxun Fu Center for Advanced Solidification Technology (CAST) School of Materials Science and Engineering Shanghai University

To explore the effect of different Mg contents on the morphology, composition, distribution, and deformation of sulfides in 49MnVS3 non-quenched and tempered steel, the inclusions were observed and counted by Zeiss metallographic microscope and scanning electron microscope, and the inclusions in the compressed samples were compared by Gleeble-3500 thermal simulation test machine. Results showed that the size of sulfide in steel decreases and the distribution uniformity of sulfide are significantly improved with the increase of Mg content. The proportion of composite inclusions in steel increases obviously, and the proportion of individual MnS decreases. The composition of the included core is in accordance with the principle of AlO → AlO + MgO·AlO → MgO·AlO + MgO → MgO → MgO + MgS. After Gleeble compression, the aspect ratio of sulfide inclusions decreases, and the spindle ratio h increases significantly.

关键词： Mg Treatment non-quenched and tempered steel Sulfide Composite Inclusions Gleeble

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Development of non-quenched and tempered bolt steel

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Baosteel Technical Research 2010年第S1期4卷 62-页

作者： BAI Xifeng~(1)),ZHAO Xuebo~(1)),REN Yuhui~(1)),WANG Bingxi~(2)) and GUO Dayong~(2)) 1) Wire rod plant,Anshan Iron & steel Co.,Ltd. 2) Technology Center,Anshan Iron & steel Co.,Ltd.,Anshan 114021,China

The 8.8 grade non-quenched and tempered bolt steel was studied according to the process conditions of wire rod plant and customer *** types of experimental steel grades were selected.10MnSiTi Nb and 20Mn2VTi(N) were c... 详细信息

关键词： non-quenched and tempered steel bolt mechanical property

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Review on regulation of MnS in non-qquenched and tempered steel

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Journal of Iron and steel Research International 2024年第4期31卷 779-789页

作者： Guo-xing Qiu Qing Du Feng Lu De-jun Miao Yong-kun Yang Xiao-ming Li School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina Laigang Technique Center Shandong Iron and Steel Group Co.Ltd.Jinan 271104ShandongChina

An overview of the current research status and control methods of MnS in non-quenched and tempered steel was *** a low-melting plastic inclusion,the morphology and distribution of MnS were influenced by various production ***,control of MnS is a systematic problem that must be integrated into the entire production *** on the production process,the factors affecting the morphology and distribution of MnS in steel were *** effects of oxygen activity,manganese,sulfur,and some alloys on MnS inclusion precipitation were summarized,mainly including MnS modification treatment and oxygen-sulfide composite precipitation *** is believed that MnS precipitates during the solidification process of steel,and controlling the solidification cooling rate could effectively regulate the size and morphology of MnS,avoiding the precipitation of ***,by changing the deformation rate,deformation amount,deformation temperature during the hot deformation process,and heating time and temperature during heat treatment,the distribution and morphology of MnS could be *** the fine control of the above process parameters,the number of II-MnS in steel could be effectively reduced,and their morphology could be improved,thereby enhancing the performance of non-quenched and tempered steel and promoting its wider ***,applying laboratory research results to industrial production is an important direction for future research efforts in this field.

关键词： MnS non-quenched and tempered steel Control technology Process parameter Morphology Distribution

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Theoretical calculation of the finishing rolling elongation in non-quenched and tempered Si-Mn steel

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Progress in Natural Science:Materials International 2006年第1期16卷 78-83页

作者： LIU Zhilin and LIN Cheng (Department of Materials and Chemical Engineering, Liaoning Institute of Technology, Jinzhou 121001, China) Department of Materials and Chemical Engineering Liaoning Institute of Technology Jinzhou 121001 China

The finishing rolling elongation in the non-quenched and tempered Si-Mn steel is theoretically calculated using the cova lent electron number nA of the strongest bond in alloying phases and the interface electron density difference △ρ. Calculations show that the finishing rolling elongation of the non-quenched and tempered Si-Mn steel can be achieved by subtracting all the elongation decrements of solution strengthening, precipitation strengthening, and interface strengthening from the elongation of the refined α-Fe matrix. The calculated results of the finishing rolling tensile strength σb, the finishing rolling yield strength σs, and the finishing elongation δ of Q345 steel and BG420CL steel agree well with the measured values.

关键词： electron structure parameters non-quenched and tempered steel elongation and calculation.

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