求翻译：图4a中的右边是母材，其组织为奥氏体，左边是焊缝则由方向性很强的柱状树枝晶和少量无一定方向性的等轴树枝晶的奥氏体及在它们的枝晶间分布的少量δ铁素体组成。是什么意思？

The right side of Figure 4a is a base metal, its austenite, on the left is the direction of the weld by the strong columnar dendrite and a small amount without a certain direction equiaxed dendritic austenite and in their branches Intergranular distribution of a small amount of δ ferrite.

Figure 4 is to the right of a mother in Vienna, the organization is on the left for austenitic weld seams, and the direction of a very strong post-shaped container and a small chip without a certain direction, such as the Crystal axis container of austenitic and in their branches across the small cr

In chart 4a right side is the parent metal, its organization is the austenite, left side is the welded joint is composed by the directive very strong columnar dentrite and the few not certain directive isometry dentrite austenite and in theirs interdendritic distribution few delta ferrite.

Base material to the right in Figure 4A, their organization for austenite, weld on the left by the directional strong pillar-shaped Dendrite and a small no axis of a direction of austenite Dendrite and distributed in their dendritic composed of a small number of δ ferrite.

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