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In situ synthesis and strengthening of powder metallurgy high speed steel in addition of LaB6

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Abstract

A novel technology which was characterized by the vacuum solid state sintering was developed for powder metallurgy high speed steels production. During sintering, both the WC and Mo2C reacted with Fe and transformed to W and Mo rich M6C carbides which were the common hard phases in high speed steels. Also, a high number of W, Mo and Fe were dissolved in VC, forming the MC carbides. The densification of the material mainly relied on the solubility effect during the M6C and MC carbides formation. By alloying with a 0.1 wt% of LaB6 to the steel, the bending strength and the fracture toughness were improved from 3290 MPa and 25.6 MPam1/2 to 4018 MPa and 29.4 MPam1/2, respectively. The TEM analysis demonstrated three types of reaction products by the LaB6 addition: the amorphous phase, the core-shell structure and the La2O3 phase. The impurity elements such as the Mg, Al, Si, S, Ca, and O were absorbed following the LaB6 addition. Moreover, the deoxidization effect caused by the LaB6 addition promoted the sintering at a high-temperature period which contributed to the bending strength and fracture toughness improvement.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, P.R. China

    Weijun Shen, Yuehui He, Qiankun Zhang, Huibin Zhang, Yao Jiang & Nan Lin

  2. Hunan Provincial Key Laboratory of Renew Energy Electric-Technology, Changsha University of Science and Technology, Changsha, 410114, P.R. China

    Linping Yu

  3. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Hunan, 411105, P.R. China

    Zhi Li

Authors
  1. Weijun Shen
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  2. Linping Yu
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  3. Zhi Li
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  4. Yuehui He
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  5. Qiankun Zhang
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  6. Huibin Zhang
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  7. Yao Jiang
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  8. Nan Lin
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Correspondence to Yuehui He.

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Shen, W., Yu, L., Li, Z. et al. In situ synthesis and strengthening of powder metallurgy high speed steel in addition of LaB6 . Met. Mater. Int. 23, 1150–1157 (2017). https://doi.org/10.1007/s12540-017-7116-8

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  • DOI: https://doi.org/10.1007/s12540-017-7116-8

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