【摘要】 利用盐浴加热循环淬火对６５Ｍｎ钢进行奥氏体晶粒的超细化，并对晶粒细化后的６５Ｍｎ钢进行超塑拉伸试验。结果表明，热轧或正火态的６５Ｍｎ钢经８１０℃循环淬火３次，奥氏体晶粒即可细化至１３级，在温度６６０～７２０℃、变形速率０．５～３．７×１０（－２）ｍｉｎ（－１）范围内呈现超塑性，δ≥２００％，最高达２９４％，σ最低仅３８ＭＰａ，ｍ值为０．３８左右。更多还原

【Abstract】 Ultrafining treatment for austenite grains of 65Mn steel by means of cyclic quench and superplastic tensing after ultrafining treatment have been investigated. The results show that the grain size may be refined to 13 grade after 3 cycles of cyclic quench at 810℃ in 65Mn steel. which had been hot-rolled or normalized,Superplasticity has been obtained at temperature 660￣720℃、strain rate 0. 5￣3. 7×10(-2)min(-1) in ultrafined 65Mn steel,the elongation may attain 294%,the maximum flow strees is only 38MPa and strain rate sensitivity m about 0. 38.更多还原