壁厚对蠕墨铸铁铸态力学性能的影响
<TABLE cellSpacing=0 cellPadding=0 border=1><TBODY>
<TR>
<TD vAlign=top width=95>
<P align=center><STRONG>熔炼条件</STRONG></P></TD>
<TD vAlign=top width=189 colSpan=2>
<P align=center><STRONG>冲天炉</STRONG></P></TD>
<TD vAlign=top width=284 colSpan=3>
<P align=center><STRONG>感应电炉</STRONG></P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P align=left>蠕虫状石墨量（％）</P></TD>
<TD vAlign=top width=189 colSpan=2>
<P align=center>95（团状5）</P></TD>
<TD vAlign=top width=284 colSpan=3>
<P align=center>95（聚片状5％）</P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P>壁厚／㎜</P></TD>
<TD vAlign=top width=95>
<P>25</P></TD>
<TD vAlign=top width=95>
<P>180</P></TD>
<TD vAlign=top width=95>
<P>25</P></TD>
<TD vAlign=top width=95>
<P>60</P></TD>
<TD vAlign=top width=95>
<P>100</P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P>珠光体量（％）</P></TD>
<TD vAlign=top width=95>
<P>10</P></TD>
<TD vAlign=top width=95>
<P>15</P></TD>
<TD vAlign=top width=95>
<P>65</P></TD>
<TD vAlign=top width=95>
<P>65</P></TD>
<TD vAlign=top width=95>
<P>70</P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P>铁素体量（％）</P></TD>
<TD vAlign=top width=95>
<P>90</P></TD>
<TD vAlign=top width=95>
<P>85</P></TD>
<TD vAlign=top width=95>
<P>35</P></TD>
<TD vAlign=top width=95>
<P>35</P></TD>
<TD vAlign=top width=95>
<P>30</P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P>抗拉强度σ<SUB><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">b</SPAN></SUB>/MPa</P></TD>
<TD vAlign=top width=95>
<P>376</P></TD>
<TD vAlign=top width=95>
<P>317</P></TD>
<TD vAlign=top width=95>
<P>381</P></TD>
<TD vAlign=top width=95>
<P>302</P></TD>
<TD vAlign=top width=95>
<P>298</P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P>屈服强度σ<SUB><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">s</SPAN></SUB>/MPa</P></TD>
<TD vAlign=top width=95>
<P>305</P></TD>
<TD vAlign=top width=95>
<P>268</P></TD>
<TD vAlign=top width=95>
<P>309</P></TD>
<TD vAlign=top width=95>
<P>268</P></TD>
<TD vAlign=top width=95>
<P>251</P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P>伸长率（％）</P></TD>
<TD vAlign=top width=95>
<P>4.6</P></TD>
<TD vAlign=top width=95>
<P>4.9</P></TD>
<TD vAlign=top width=95>
<P>1.4</P></TD>
<TD vAlign=top width=95>
<P>1.5</P></TD>
<TD vAlign=top width=95>
<P>1.3</P></TD></TR>
<TR>
<TD vAlign=top width=95>
<P>硬度HBS</P></TD>
<TD vAlign=top width=95>
<P>161</P></TD>
<TD vAlign=top width=95>
<P>153</P></TD>
<TD vAlign=top width=95>
<P>202</P></TD>
<TD vAlign=top width=95>
<P>187</P></TD>
<TD vAlign=top width=95>
<P>166</P></TD></TR></TBODY></TABLE><FONT face=Arial> 当蠕化率高时，不同断面的组织均匀，性能变化不大。蠕化率达到最大值时的壁厚称为临界壁厚；小于临界壁厚。冷却速度大，球墨增多、蠕墨减少或消失；大于临界壁厚，冷却速度减小，但蠕化率不再提高。</FONT>
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