珠光体间间距分级
<TABLE borderColor=#000000 height=306 cellSpacing=0 cellPadding=1 width=398 align=center border=1><TBODY>
<TR>
<TD width=41>
<DIV align=center>级别</DIV></TD>
<TD width=99>
<DIV align=center>名称</DIV></TD>
<TD width=244>
<DIV align=center>说明</DIV></TD></TR>
<TR>
<TD>
<P align=center>1</P></TD>
<TD>
<P align=center>索氏体型珠光体</P></TD>
<TD>
<P align=center>放大500倍下，铁素体和渗碳体难以分辨</P></TD></TR>
<TR>
<TD>
<P align=center>2</P></TD>
<TD>
<P align=center>细片状珠光体</P></TD>
<TD>
<P align=center>放大500倍下，片间距≤1mm</P></TD></TR>
<TR>
<TD>
<P align=center>3</P></TD>
<TD>
<P align=center>中等片状珠光体</P></TD>
<TD>
<P align=center>放大500倍下，片间距＞1~2mm</P></TD></TR>
<TR>
<TD>
<P align=center>4</P></TD>
<TD>
<P align=center>粗片状珠光体</P></TD>
<TD>
<P align=center>放大500倍下，片间距＞2mm</P></TD></TR></TBODY></TABLE>
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