简介:Aself-developedelectromagneticinduction-heatingdevicewasusedtoinvestigatethevariationinthemicrostructureandpropertiesofX80pipelinesteelintherapidinductiontemperingprocessatdifferentprocessparameters.Theeffectsofthetemperingconditionontoughness,microstructure,sizeanddistributionofprecipitatesofX80pipelinesteelwereobservedusingametallographicmicroscopyandscanningelectronmicroscopy.Comparedwiththesamplespreparedviatraditionaltemperingtechniques,resultsshowthatthesamplespreparedviarapidinductiontemperinghadimprovedperformances.Whentheheatingtemperatureis590℃,ataholdingtimeof90s,itwasfoundthatacicularferritewasrefined,carboniteprecipitationwassmall,andprecipitateswereevenlydistributedinthematrix.Thelow-temperatureimpactenergy,alsoknownastheimpactabsorptionenergy,at-40℃wasfoundtobe430.5Jfortherapidinductiontemperingsamplesand323.2Jforthetraditionallytemperedsample.Thelow-temperatureimpactenergyat-60℃wasfoundtobe351.3Jfortherapidinductiontemperedsampleand312.1Jforthetraditiontemperingsample.
简介:摘要目的探讨医学影像观察在诊断泌尿系结石的应用价值,以供临床参考。方法选取我院2013年1月~2015年6月收治的泌尿系结石患者86例,均给予B超和普通X线检查,比较两种诊断技术的异同之处。结果超声检查的阳性检出率94.2%大于X线的检出率86.0%,两种检查方法在泌尿系结石的检出阳性率上无明显差异(P>0.05);对于肾结石及输尿管结石患者,不同的检查方法得到的阳性率差异具有统计学意义(P<0.05),而对于膀胱结石,两者检查结果相比没有统计学意义(P>0.05),。结论X线可显示出泌尿系结石的致密影,并能过对结石的大小、形状及成分进行判断。B超能够有效诊断泌尿系结石的肾积水情况、肾脏实质、寻找病因等。超声与X线对泌尿系结石的诊断各有特点,临床可联合应用超声和X线检查提高临床泌尿系结石检出率。