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Abstract：
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In this paper, the structural superplasticity of the W6Mo5Cr4V2 high speed steel wasstudied. The results showed that after it was treated by 1040℃, 2 times circular quenching, the struc-tural superplasticity could be reached under conditions of (2. 0~5. 5) × 10-4s-1 and temperature of 780~815℃. The superplastic elongation of this steel could be reached 192%, the maximum flow stress wasonly 58. 2 MPa and strain rate sensistivity (m) was 0. 27 under the optimum conditions of tensile testwith ε0= 3. 33 × 10-4s -1, 810 ℃.
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Funds：
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AuthorIntro：
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Reference：
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1安运铮.热处理工艺学.北京:机械工业出版社,1982:117～118
2约翰丁.伯克等著,王燕文等译.超细晶粒金属.北京:国防工业出版社,1982;123～152
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