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【单选题】
关于铁碳合金基本相以下哪些说法是正确的A.
奥氏体是硬度较低、塑性较高的组织，适用于压力加工成形
B.
渗碳体是铁与碳形成的金属化合物，渗碳体含量越低，分布越均匀，材料的硬度和强度越高
C.
珠光体性能介于铁和渗碳体之间，强度较高，硬度适中，有一定的塑性
D.
体是碳溶于α-Fe中所形成的间隙固溶体，硬度、强度很低，塑性很高，体心立方晶格
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