摘要:
研究了淬火温度对30MnSi钢棒显微组织、奥氏体晶粒尺寸、拉伸性能和延迟断裂性能的影响,并对拉伸断口形貌进行了观察。结果表明,随着淬火温度从865℃升高至1 025℃,组织从回火屈氏体和少量铁素体转变为粗大的回火屈氏体,奥氏体晶粒尺寸不断增大,且当淬火温度在945℃及以上时,奥氏体晶粒粗化和长大趋势较为明显;随着淬火温度的升高,30MnSi钢棒的抗拉强度和断裂时间都表现出先增加而后降低的趋势,当淬火温度为945℃时,30MnSi钢棒的耐延迟断裂能力最好,即持续200 h不发生断裂。
Abstract:
The effects of quenching temperature on microstructure, austenite grain size, tensile properties and delayed fracture properties of 30 MnSi steel bars were investigated, and the morphology of tensile fracture was observed. The results show that as the quenching temperature rises from 865℃ to 1 025℃, the tempered troostite and the few ferrite transforme into coarsened troostite, and the sizes of the austenite grains keep increasing, the coarsening and growing of the austenite grain obvious when the quenching temperature is 945℃; that with the increase of quenching temperature, the tensile strength and time for breaking of 30 MnSi steel bars increase and then decrease, and when the quenching temperature is 945℃, the 30 MnSi steel bar has the best delay fracture performance, no breaking within continuous 200 hours.
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