<font face="宋体" color="#000000" size="4" style="BACKGROUND-COLOR: #ffffff;"><p><span style="BACKGROUND: white; COLOR: black; mso-bidi-font-family: Arial;"><font size="3">这里应该涉及到回火脆性的评定<span lang="EN-US">,</span>一般采取步冷实验<span lang="EN-US">.<p></p></span></font></span></p><p><span style="BACKGROUND: white; COLOR: black; mso-bidi-font-family: Arial;"><font size="3">近期的大量研究证明,上列</font><a name="baidusnap1"></a><font size="3">铬钼钢的回火脆性主要起因于钢中<span lang="EN-US"></span>、<span lang="EN-US">Sn</span>、<span lang="EN-US">Sb</span>和<span lang="EN-US">As</span>等微量杂质。合金元素<span lang="EN-US">Si</span>和<span lang="EN-US">Mn</span>也对钢的回火脆性起一定的促进作用。<span lang="EN-US"><p></p></span></font></span></p><p><span lang="EN-US" style="BACKGROUND: white; COLOR: black; mso-bidi-font-family: Arial;"><a id="ctl00_MasterContentPlaceHolder_GridView2_ctl04_HyperLink6" href="http://scholar.ilib.cn/Abstract.aspx?A=hgsbygd200204022"><font size="3"></font></a><p></p></span></p><p><span style="BACKGROUND: white; COLOR: black; mso-bidi-font-family: Arial;"><font size="3">高温临氢设备常使用的<span lang="EN-US">12Cr1MoV</span>等</font><a name="baidusnap0"></a><font size="3">铬钼钢,长期在<span lang="EN-US">325-575oC</span>下使用,或者从此温度范围缓慢冷却,脆性转变温度会升高,韧性降低,这种现象称为回火脆化。</font><span lang="EN-US"><br/><br/></span><font size="3">研究表明:影响<span lang="EN-US">2.25Cr-1Mo</span>钢回火脆化的主要因素为化学成分和热处理条件。<span lang="EN-US"> P</span>、<span lang="EN-US">Sb</span>、<span lang="EN-US">Sn</span>和<span lang="EN-US">As</span>等杂质元素越多,奥氏体化温度越高,<span lang="EN-US">2.25Cr-1Mo</span>钢对回火脆化越敏感。<span lang="EN-US"><p></p></span></font></span></p><p></p></font>
[此贴子已经被作者于2006-11-11 15:46:31编辑过]
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