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OALib Journal期刊
ISSN: 2333-9721
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一种低碳Mn-B系超高强度钢板热成形后的氢致延迟断裂行为
DOI: 10.3724/SP.J.1037.2013.00159, PP. 1153-1159
Keywords: 低碳Mn-B钢,超高强度钢板,热成形,氢致延迟断裂,氢热分析
Abstract:
采用恒载荷延迟断裂、氢热分析(TDS)等实验方法,研究了一种低碳Mn-B系超高强度热成形钢板在热成形态和常规淬火回火态的氢致延迟断裂行为.结果表明,经热成形后,试样缺口临界应力和断裂寿命均高于常规淬火态,并达到常规淬火态+100℃回火试样的水平.热成形试样经200℃回火处理后,具有更高的缺口临界应力和断裂寿命.SEM观察发现,在外加应力和腐蚀液的作用下,热成形试样裂纹源区的断裂机制由常规淬火试样的沿晶+穿晶准解理的混合断裂变为穿晶准解理+少量沿晶的混合断裂.TDS实验结果表明,在临界应力作用下,在腐蚀液中加载100h后,试样中的H含量均明显提高.由于试样在热成形过程中发生较高程度的自回火,导致经应力腐蚀后,试样在断裂过程中能承受的H量高于淬火态试样和常规淬火态+100℃回火试样,使试样具有更高的延迟断裂抗力.因此,经热成形处理后,试样具有良好的耐延迟断裂性能,且回火处理能使试样的耐延迟断裂性能得到进一步提高.
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