| QI Hai-quan,YI Cheng-gong,SUN Yan-huan.Effects of Sulfurizing Treatment on Microstructure and Scratch Resistance of W360 Hot Work Die Steel[J],46(9):134-140 |
| Effects of Sulfurizing Treatment on Microstructure and Scratch Resistance of W360 Hot Work Die Steel |
| Received:March 27, 2017 Revised:September 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.09.021 |
| KeyWord:sulfurization mould steel scratch resistance friction coefficient FeS |
| Author | Institution |
| QI Hai-quan |
a. Key Laboratory of Nonferrous Metals and Materials Processing Technology of Ministry of Education, b. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin , China |
| YI Cheng-gong |
a. Key Laboratory of Nonferrous Metals and Materials Processing Technology of Ministry of Education, b. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin , China |
| SUN Yan-huan |
a. Key Laboratory of Nonferrous Metals and Materials Processing Technology of Ministry of Education, b. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin , China |
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| Abstract: |
| The work aims to further improve scratch resistance of moulds by sulfidizing Bohler W360 hot work die steel in low temperature liquid process as sulfurizing treatment can reduce "bite force" of frictional interface. Provided with alkaline sulfurizing agent system consisting of sulfur powder, sodium hydroxide and deionized water, effects of sulfur concentration on structure of sulfurizing layer by designing different sulfur content (mass fraction). Morphology and structure of the sulfurizing layer were analyzed by using SEM-EDS and XRD. Surface hardness as well as friction and wear properties of the material before and after sulfurization were tested and evaluated by using Rockwell hardness tester and MRH-3A high speed ring-on-block abrasion tester. By adopting low temperature liquid sulfurizing process, a "hardened" structure and "microparticles+interspace" structure took shape on W360 die steel as a result of different sulfur mass fractions. XRD results showed that the layer consisted of FeS and FeS2. The hardness test showed that the surface hardness of W360 die steel did not change (52~53HRC) after sulfurization, which was consistent with the original hardness. However, friction and wear test data showed that sulfurization could significantly reduce friction coefficient, wear loss weight and grinding crack width of the W360 steel at early stage of friction. The data showed that the scratch resistance was best when the sulfur mass fraction was 1.5%. Low temperature liquid sulfurizing process can improve scratch resistance of the material by reducing friction coefficient of mould steel. Mass fraction of sulfur element in sulfuring agent has a significant effect on microstructure and scratch resistance. |
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