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    	<div class="nyNewsDetail_Title"><h1>各个“硬”氏代表大集合</h1></div>
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            <span><img src="/skins/158899/images/date01.png" />更新时间：2023-07-03</span><span><img src="/skins/158899/images/hit.png" />点击次数：2110</span>
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            <p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">1.洛氏硬度</span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体"> 洛氏硬度（Rockwellhardness），这是由洛克威尔（S.P.Rockwell）在1921年提出来的，是使用洛氏硬度计所测定的金属材料的硬度值。该值没有单位，只用代号“HR"表示，其测量方法是，在规定的外加载荷下，将钢球或金刚石压头垂直压入待试材料的表面，产生凹痕，根据载荷解除后的凹痕深度，利用洛氏硬度计算公式HR=（K-H）/C便可以计算出洛氏硬度。洛氏硬度值显示在硬度计的表盘上，可以直接读取。洛氏硬度是以压痕塑性变形深度来确定硬度值指标。以0.002毫米作为一个硬度单位。当HB&gt;450或者试样过小时，不能采用布氏硬度试验而改用洛氏硬度计量。它是用一个顶角120°的金刚石圆锥体或直径为1.59、3.18mm的钢球，在一定载荷下压入被测材料表面，由压痕的深度求出材料的硬度。根据试验材料硬度的不同，分三种不同的标度来表示： </span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">HRA：是采用60kg载荷和钻石锥压入器求得的硬度，用于硬度高</span></span>的材料(如硬质合金等)。</p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">HRB：是采用100kg载荷和直径1.58mm淬硬的钢球，求得的硬度，用于硬度较低的材料(如退火钢、铸铁等)。</span></span></p><p><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">HRC：是采用150kg载荷和钻石锥压入器求得的硬度，用于硬度很高的材料</span></span></p><p><br/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img70.chem17.com/9/20230703/638239736400032127215.png" title="洛氏.png" alt="洛氏.png"/></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">2.布氏硬度</span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">布氏硬度</span><span style="font-family:宋体">(HB)一般用于材料较软的时候，如有色金属、热处理之前或退火后的钢铁。洛氏硬度(HRC)一般用于硬度较高的材料，如热处理后的硬度等等。</span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">布氏硬度</span><span style="font-family:宋体">(HB)是以一定大小的试验载荷，将一定直径的淬硬钢球或硬质合金球压入被测金属表面，保持规定时间，然后卸荷，测量被测表面压痕直径。布氏硬度值是载荷除以压痕球形表面积所得的商。一般为：以一定的载荷将一定大小的淬硬钢球压入材料表面，保持一段时间，去载后，负荷与其压痕面积之比值，即为布氏硬度值(HB)，单位为公斤力/mm2 (N/mm2)。测试载荷与测试钢球的直径需根据材料的实际性能再确定。 </span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体"></span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img66.chem17.com/9/20230703/638239736867850497544.png" title="布氏.png" alt="布氏.png"/></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">3.维氏硬度</span></span></p><p><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">维氏硬度试验方法是英国史密斯（</span><span style="font-family:宋体">R.L.Smith）和塞德兰德（C.E.Sandland）于1925年提出的。英国的维克斯—阿姆斯特朗（Vickers-Armstrong）公司试制了第一台以此方法进行试验的硬度计。和布氏、洛氏硬度试验相比，维氏硬度试验测量范围较宽，从较软材料到超硬材料，几乎涵盖各种材料。</span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体"></span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img66.chem17.com/9/20230703/638239737335098041310.png" title="维氏.png" alt="维氏.png"/></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">4.里氏硬度 </span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">里氏硬度是以</span><span style="font-family:宋体">HL表示，里氏硬度测试技术是由瑞士狄尔马，里伯博士发明的，它是用一定质量的装有碳化钨球头的冲击体，在一定力的作用下冲击试件表面，然后反弹。由于材料硬度不同，撞击后的反弹速度也不同。在冲击装置上安装有永磁材料，当冲击体上下运动时，其外围线圈便感应出与速度成正比的电磁信号，再通过电子线路转换成里氏硬度值。 </span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img63.chem17.com/9/20230703/638239737680236909578.png" title="里氏.png" alt="里氏.png"/></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">5.肖氏硬度 </span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">简称</span><span style="font-family:宋体">HS。表示材料硬度的一种标准。由英国人肖尔(Albert F.Shore)首先提出。</span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">应用弹性回跳法将撞销从一定高度落到所试材料的表面上而发生回跳。撞销是一只具有小锥，它</span>上面常镶有金刚钻。测试数值为<span style="font-family:宋体">1000x撞销返回速度/撞销初始速度（即为碰撞前后的速度比乘以1000）</span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img62.chem17.com/9/20230703/638239738174770534614.png" title="肖氏.png" alt="肖氏.png"/></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">6.巴氏硬度 </span></span></p><p><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">巴柯尔</span><span style="font-family:宋体">(Barcol)硬度(简称巴氏硬度), 最早由美国 Barber-Colman公司提出，是近代国际上广泛采用的一种硬度门类， 一定形状的硬钢压针，在标准弹簧试验力作用下，压入试样表面，用压针的压入深度确定材料硬度，定义每压入0.0076mm为一个巴氏硬度单位。巴氏硬度单位表示为HBa。</span></span></p><p><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体"></span></span></p><p style="text-align: center"><img style="max-width: 800px; max-height: 300%; width: 248px; height: 296px;" src="https://img65.chem17.com/9/20230703/638239739385106680752.png" title="巴氏.png" alt="巴氏.png" width="248" height="296"/></p><p><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体"></span></span><br/></p><p><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体"></span></span></p><p style="text-align: center"><img style="max-width: 800px; max-height: 300%; width: 1px; height: 1px;" src="https://img65.chem17.com/9/20230703/638239738599266635192.png" title="巴氏.png" alt="巴氏.png" width="1" height="1"/></p><p><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体"></span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">7.努氏硬度</span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">努氏硬度是作为绝对数值而测得的硬度，主要在加工方面使用该数值。一般来说，金刚石的努氏硬度为</span><span style="font-family:宋体">7000~8000千克/平方毫米</span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img70.chem17.com/9/20230703/638239739971258478697.png" title="努氏.png" alt="努氏.png"/></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">8.韦氏硬度</span></span></p><p style="margin-left:0;text-indent:32px;text-autospace:ideograph-numeric;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 宋体;color: rgb(25, 25, 25);letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:宋体">一定形状的硬钢压针，在标准弹簧试验力作用下压入试样表面，用压针的压入深度确定材料硬度，定义</span><span style="font-family:宋体">0.01mm的压入深度为一个韦氏硬度单位。韦氏硬度单位表示为HW。</span></span></p><p style="text-align: center"><img style="max-width: 800px; max-height: 300%; width: 286px; height: 169px;" src="https://img65.chem17.com/9/20230703/638239740461632765394.png" title="韦氏.png" alt="韦氏.png" width="286" height="169"/></p><p><br/></p><p><br/></p><p><br/></p> 
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