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采用超细晶粒与形变热处理复合工艺,研究了原始组织为铅淬索氏体、冷拔变形为50%—78%的65Mn钢丝进行形变热处理时的工艺,以及各项工艺参数对钢丝力学性能的影响。试验证明:工艺参数中起控制作用的为预冷变形度、热拉丝形变度、加热速度和回火温度。奥氏体化温度及分级冷却时间可在较大范围内变化而不影响性能。处理后钢丝(φ≤3.0mm)的性能可达σ_b≥2 000MPa,?≥50%超高强韧水平,相应高出国标规定550MPa和7%,与瑞典Garphyttan公司OTEVA-31规定相比,σ_b和?也分别高出300—400MPa和2%。这时钢丝的相应晶粒度为11—13级。
Ultrafine grained and deformation heat treatment composite process was used to study the process of deformation heat treatment of 65Mn steel whose original structure is lead-hardened sorbite and cold-drawing deformation is 50% -78%, and the mechanical properties of the steel Impact. Tests show that: the process parameters play a controlling role for the pre-cooling deformation, hot drawing deformation, heating rate and tempering temperature. The austenitizing temperature and the fractional cooling time can vary over a wide range without affecting performance. The treated steel wire (φ≤3.0mm) has the performance of σ_b ≥2000MPa and ≥50% of ultra-high strength and toughness, which is 550MPa and 7% higher than the national standard. Compared with the regulation of OTEVA-31 of Sweden’s Garphyttan company, σ_b and ? Also higher than 300-400MPa and 2%. At this time the corresponding grain size of the wire 11-13 level.