通过不同温度条件下不同厚度、不同缺口取向含V形缺口试样进行3点弯曲试验研究，发现X70管线钢具有严重的各向异性现象，其在平行钢板表面方向和沿钢板厚度方向力学性能差异较大。
The effects of thickness and notch orientation on the toughness of X70 pipeline steel samples with V notch were investigated experimentally by use of the 3-point bending test at different temperature.
在各弯曲试样得到不同的预应变后，又对其进行反向加载，记录不同预应变下各试样反向加载的弯矩随表面应变的变化曲线。
In these experiments, specimens were bending to produce different pre-strain respectively, and then reverse bending were taken one by one.
结果表明，保护性高温烧结工艺的发热体可进行热态弯曲成形，表面没有发现裂纹，试样中的气孔已明显球化。
The result shows that the heating element of protect high temperature burning procedure could heat bend. No crack on the surface was found and pore was evidence spheroid.
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