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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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预变形对低合金高碳钢超塑性变形行为的影响
, PP. 1106-1110
Keywords: 低合金高碳钢,球化,细化,流变抗力,超塑性,m值
Abstract:
在Gleeble1500D热模拟试验机上进行单轴压缩实验,研究了低合金高碳钢连续冷却至珠光体转变孕育期变形时的组织演变过程,并探讨了所得组织的超塑性.结果表明组织演变过程包括珠光体相变、渗碳体球化和铁素体再结晶3个阶段,最终形成微米级(约1μm)铁素体等轴晶粒+亚微米及纳米级渗碳体颗粒的复相组织;利用速率突变法测得该复相组织在700℃,1×10-4-2×10-4s-1应变速率下m值(应变速率敏感性指数)可达0.40;随预变形量增大,所得组织在700℃各应变速率下的流变抗力降低.
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