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【单选题】
下列关于低碳钢及不易淬火的低合金钢HAZ的组织分布区的说法错误的是______。A.
熔合区由于晶界与晶内局部熔化，成分与组织不均匀分布，过热严重，塑性差，所以是焊接接头的薄弱环节。
B.
过热区由于焊后冷却时，奥氏体相变产物因晶粒粗化使塑性、韧性降低，所以是焊接接头的薄弱环节。
C.
相变重结晶区在空可以的到晶粒细小而均匀的珠光体和铁，因此其塑性和韧性好。
D.
不完全重结晶区由于受热不严重，所以性能比相变重结晶区好。
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