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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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过共析钢温变形过程中的组织演变I.铁素体的等轴化及Al的影响
, PP. 151-155
Keywords: 过共析钢,温变形,等轴铁素体,渗碳体,Al
Abstract:
利用Gleeble1500热模拟试验机进行单轴热压缩实验,结合SEM,TEM和EBSD等方法研究了过共析钢温变形过程中的组织演变规律,重点讨论了铁素体的等轴化演变过程,同时考察了合金元素Al的影响.结果表明过共析钢温变形经历片层渗碳体的熔断球化、铁素体的等轴化以及渗碳体的溶解再析出等过程.温变形初期,片层状渗碳体缺陷处局部熔断的同时其近邻铁素体内产生大量位错,并通过动态回复过程形成亚晶;继续变形过程中,由于渗碳体粒子钉扎,亚晶发生转动,导致大角度晶界的形成,即铁素体通过连续动态再结晶过程实现等轴化.Al的加入细化了铁素体晶粒尺寸,提高了等轴状铁素体晶粒大角度晶界的比例.
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