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| Effect of lean process on hardenability of powder |
| SU Feng-ge, ZHENG Zhuo, WANG Zhi-rong |
| Jiande Yitong Metal Powder Material Co.,Ltd., Hangzhou 311613, China |
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Abstract Fe-4.00Ni-1.50Cu-0.50Mo powders with the same composition were prepared by hybrid method and diffusion alloying method. The effects of cooling rate and carbon content on the hardenability of the two materials were studied. The metallographic structure of the material was observed by optical microscope, and its continuous sintering expansion curve and sintering hardness at the cooling rate of 1.06-1.94 ℃/s were measured through thermal expansion instrument and Rockwell hard-meter to characterize the hardenability of the samples. The results show that the hardenability of the powder is related to the martensite content after sintering. The martensite content increases with the increase of carbon content and cooling rate, and its hardenability also increases correspondingly. When the mass percent of carbon is 0.50%, the hardenability of the two powders is equivalent. With the increase of carbon content, the hardenability of powder prepared by hybrid method is obviously higher than that of diffusion alloy method. Mo element of complete prealloying plays a major role in the hardenability of the material, and carbon content has more obvious hardening effect on the material with high alloying degree.
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Received: 24 November 2017
Published: 25 April 2019
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2019, Vol. 29 
